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While the ores may be rarer, they will also be easier to find due to having more exposed underground areas as a result of the larger caves. Also, there will be rare veins that give you a whole ton of the ore. Really, only strip mining has been nerfed, as now ores spawn in more diverse y levels and it's harder to get a level that's good for most things. Strip mining was the most grindy method, so I see this as a win.

While they did remove the items from the creative inventory, I do not see anything stating that they removed them completely, which implies that you could get them via commands or add the recipes back through a datapack.

Quote from eiche_brutal»

I don't like the bundle at all. It only allows you to store 1 stack of items, so it's realy just useful for keeping trash.

And i don't think it's necessary for the very early game, since you would actually collect stuff you need to survive and make a small base.

I know that hunting rabbits without carrots isn't fun but i don't think the recipe is that bad.

Shulker shells are the lategame items, unless you rush the game. In that case you don't need bundles, right?

They're useful for a lot more than trash. Have a single nether star? Put it in a bundle and store 63 more items with it. Have a couple of eyes of ender? Put it in a bundle. Have some crying obsidian from piglin trades? The bundle is perfect for that.

I created my world in an older snapshot, but actually found at least 5 veins of diamond totaling about 25 individual diamond pieces in one cave. Given, it was one of the bigger ones and it networked with a lot of others, but I've seen far better on the internet. I only explored it in about half-hour intervals (and didn't explore the whole thing), so I can't really say much about how long collecting would take, and the data may be a bit outdated, but I think this is still something to consider.

Quote from allyourbasesaregone»

I'm not too fond of this reverting they did with snapshot 15.

It feels like the team doesn't know what they're doing, which is understandable, but to tease people to a bunch of big changes and then revert them all in a couple weeks doesn't give great faith to the game's changes.

I for one didn't wholeheartedly like the new caves or elevation depth (and matching ore generation functions), but I accepted it as a necessary change to make 1.17 truly "The CAVE Update!". Now it feels like Minecraft doesn't know if it's brave enough to make this jump or not, and the consequences on snapshot worlds and people's confusion around ores is becoming very clear.

I don't think it has a lot to do with bravery, I think they're just delaying the changes to retain stability until they can get it working better. They didn't entirely remove the new generation either, they just moved it over to the experimental features that can be activated with a datapack. I think these radical changes very much qualify as "experimental."

I'm questioning the decision to allow for ore compacting before smelting. Essentially, this makes a furnace (or blast furnace) more unnecessary for most caving trips. Before you had to continuously smelt your ores so that you could end up holding more in the long run. This made it so that it was desirable to set up a "base" where you could come back to and reap your resources while you go out mining. Now, you only need to smelt up to 8 ores at a time if one of your pieces of gear breaks. It's shorter and happens less often, so the motivation to smelt is less.

Alright, I got it working. You had a missing brace after the first "default_fluid" key and you were missing the keys "deepslate_enabled" "noise_caves_enabled" and "aquifiers_enabled" under "dimensions.minecraft:overworld.settings" I've fixed everything, so you can just copy and paste this code:

{	
  "bedrock_roof_position": -2147483648,
  "bedrock_floor_position": 0,
  "sea_level": 63,
  "disable_mob_generation": false,
  "noise_caves_enabled": true,
  "aquifers_enabled": true,
  "deepslate_enabled": true,
  "default_block": {
    "Name": "minecraft:stone"
  },
  "default_fluid": {
    "Name": "minecraft:water",
    "Properties": {
      "level": "0"
	}
   },
  "generate_features": true,
  "bonus_chest": false,
  "seed": 0,
  "dimensions": {
    "minecraft:overworld": {
      "type": "minecraft:overworld",
      "generator": {
        "type": "minecraft:noise",
        "seed": 0,
        "biome_source": {
          "type": "minecraft:vanilla_layered",
          "seed": 0
        },
        "settings": {
          "name": "minecraft:overworld",
          "bedrock_roof_position": -10,
          "bedrock_floor_position": 0,
		  "deepslate_enabled": true,
		  "noise_caves_enabled": true,
  		  "aquifers_enabled": true,
          "sea_level": 63,
          "disable_mob_generation": false,
          "default_block": {
            "Name": "minecraft:stone"
          },
          "default_fluid": {
            "Name": "minecraft:water",
            "Properties": {
              "level": "0"
            }
          },
          "noise": {
            "min_y": 0,
            "height": 256,
            "density_factor": 1,
            "density_offset": -0.46875,
            "size_horizontal": 1,
            "size_vertical": 2,
            "simplex_surface_noise": true,
            "random_density_offset": true,
            "sampling": {
              "xz_scale": 1,
              "y_scale": 1,
              "xz_factor": 80,
              "y_factor": 160
            },
            "bottom_slide": {
              "target": -30,
              "size": 0,
              "offset": 0
            },
            "top_slide": {
              "target": -10,
              "size": 3,
              "offset": 0
            }
          },  
		  "structures": {
            "stronghold": {
              "distance": 32,
              "spread":3,
              "count": 128
            },
            "structures": {
				"minecraft:buried_treasure": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:ruined_portal": {
				"spacing": 40,
				"separation": 15,
				"salt": 34222645
			  },
			  "minecraft:mansion": {
				"spacing": 80,
				"separation": 20,
				"salt": 10387319
			  },
			  "minecraft:nether_fossil": {
				"spacing": 2,
				"separation": 1,
				"salt": 14357921
			  },
			  "minecraft:endcity": {
				"spacing": 20,
				"separation": 11,
				"salt": 10387313
			  },
			  "minecraft:igloo": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357618
			  },
			  "minecraft:fortress": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:bastion_remnant": {
				"spacing": 27,
				"separation": 4,
				"salt": 30084232
			  },
			  "minecraft:swamp_hut": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357620
			  },
			  "minecraft:monument": {
				"spacing": 32,
				"separation": 5,
				"salt": 10387313
			  },
			  "minecraft:pillager_outpost": {
				"spacing": 32,
				"separation": 8,
				"salt": 165745296
			  },
			  "minecraft:ocean_ruin": {
				"spacing": 20,
				"separation": 8,
				"salt": 14357621
			  },
			  "minecraft:mineshaft": {
				"spacing": 1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:shipwreck": {
				"spacing": 24,
				"separation": 4,
				"salt": 165745295
			  },
			  "minecraft:desert_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357617
			  },
			  "minecraft:stronghold": {
				"spacing":1,
				"separation": 0,
				"salt": 0
			  },
			  "minecraft:jungle_pyramid": {
				"spacing": 32,
				"separation": 8,
				"salt": 14357619
              }
            }
          }
        }
      }
    },
    "minecraft:the_nether": {
      "type": "minecraft:the_nether",
      "generator": {
        "type": "minecraft:noise",
        "seed": 0,
        "biome_source": {
          "type": "minecraft:multi_noise",
          "seed": 0,
          "altitude_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "temperature_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "humidity_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "weirdness_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1,
              1
            ]
          },
          "biomes": [
            {
              "biome": "minecraft:nether_wastes",
              "parameters": {
                "altitude": 0,
                "temperature": 0,
                "humidity": 0,
                "weirdness": 0,
                "offset": 0
              }
            },
            {
              "biome": "minecraft:soul_sand_valley",
              "parameters": {
                "altitude": 0,
                "temperature": 0,
                "humidity": -0.5,
                "weirdness": 0,
                "offset": 0
              }
            },
            {
              "biome": "minecraft:crimson_forest",
              "parameters": {
                "altitude": 0,
                "temperature": 0.4,
                "humidity": 0,
                "weirdness": 0,
                "offset": 0
              }
            },
            {
              "biome": "minecraft:warped_forest",
              "parameters": {
                "altitude": 0,
                "temperature": 0,
                "humidity": 0.5,
                "weirdness": 0,
                "offset": 0.375
              }
            },
            {
              "biome": "minecraft:basalt_deltas",
              "parameters": {
                "altitude": 0,
                "temperature": -0.5,
                "humidity": 0,
                "weirdness": 0,
                "offset": 0.175
              }
            }
          ]
        },
        "settings": "minecraft:nether"
      }
    },
    "minecraft:the_end": {
      "type": "minecraft:the_end",
      "generator": {
        "type": "minecraft:noise",
        "seed": 0,
        "biome_source": {
          "type": "minecraft:the_end",
          "seed": 0
        },
        "settings": "minecraft:end"
      }
    }
  }
}

There's an unnecessary comma at the end of your code. I haven't tried compiling yet, so I'm not sure if that's the problem, but it's worth trying to remove that comma and see if it works. As far as I can tell, custom world generation hasn't changed in the latest versions.

Did they fix enchantments?

Also, I found this custom world setting file that will give you a world with both lush and dripstone caves:

{
  "bonus_chest": false,
  "dimensions": {
    "minecraft:overworld": {
      "type": "minecraft:overworld",
      "generator": {
        "biome_source": {
          "humidity_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1.0,
              1.0
            ]
          },
          "altitude_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1.0,
              1.0
            ]
          },
          "weirdness_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1.0,
              1.0
            ]
          },
          "biomes": [
            {
              "parameters": {
                "altitude": 0.0,
                "weirdness": 0.0,
                "offset": 0.0,
                "temperature": 0.0,
                "humidity": -0.5
              },
              "biome": "minecraft:dripstone_caves"
            },
            {
              "parameters": {
                "altitude": 0.0,
                "weirdness": 0.0,
                "offset": 0.0,
                "temperature": 0.0,
                "humidity": 0.25
              },
              "biome": "minecraft:lush_caves"
            }
          ],
          "temperature_noise": {
            "firstOctave": -7,
            "amplitudes": [
              1.0,
              1.0
            ]
          },
          "type": "minecraft:multi_noise"
        },
        "settings": "minecraft:overworld",
        "type": "minecraft:noise"
      }
    }
  },
  "generate_features": true
}

Honestly, I've noticed a much higher amount of mobs in the new cave systems. I can't even mine one vein without a skeleton coming to shoot me and a creeper coming up from behind.

Enchantments don't work in 21w10a

Archaeology hasn't been implemented yet, and there are many unknowns about it.

1. We have no idea how rare the sites will be or how quickly we will be able to find them.
2. If we do find them, we have no idea how common it will be to get diamonds or how many chances we will get per site.
3. We have no idea how hard it will be to obtain a brush or how quickly you can make one.

It is conceivable that simple caving will be faster, especially when you consider that the large caves expose a lot more ore, and there was recently official mention of "really big" ore veins coming in the future that will be very rare but very rich in resources (it was stated that they're big enough to build a castle or mining village around these veins). Caving could even beat strip-mining if they design the ore generation system accordingly. And there's still the very lucrative strategy of trading with villagers in order to get diamond gear, which is fairly quick.

I don't think archaeology will end up being a mainstream way of obtaining diamonds or really any other valuable materials unless it's just incredibly overpowered when it gets implemented.

Quote from chaskuchar1»

this is so sad. i started a game. had the bonus chest. figured out how to open the chest and got the axe. chopped down the tree. and can't figure out how to get the crafting table before i get killed. i looked at the keyboard optentions but have no idea what they describe for doing something with my possestions. back to the controller. it was hard enough to figure it out. i am so used eto playing bedrock i play instinctively on the controller. thanks. chas

Press e to open your inventory, and you will see a 2x2 grid in the top left corner. First, put some wood into one of those slots to create planks. Then, take the planks out and put one in each slot to create a crafting table.

Usually bread, since you can get a lot of that from villages. If there's no village, I usually just end up killing animals. Maybe I'll get some fish or kelp as well.

The new ores don't look bad. They look very similar to the newer ores like copper and nether gold. They're even comparable to emerald and nether quartz. Also, this update was necessary and it does benefit the community. As explained, the update was to allow each ore to have a different shape in order to allow identification by something other than color, which helps with accessibility for colorblind people.

It's also generally better for each ore to have a unique texture instead of them all being basically the same with a different color filled into the "ore" part. This makes them all look very similar unless you specifically process the color. In the past there was a problem with mistaking lapis for diamonds - Now that mistake is virtually impossible.

And the texture pack is optional, as explained by TheMasterCaver.