Interesting that you didn't mention bow and arrow as the first example. It already looks weird when the character sticks his offhand item through the bow.
Personally I wouldn't want this restriction. I love how convenient the controls got in 1.9 and this would add more item switching again.
I think in general the "profession" and "career" could be merged and they could all get different colours. If you just randomly approach villagers, nothing will change, except that they have more colours in their coats, which is good. And if you look for specific villagers, you can do that faster, you can do filter them as babies, you can find a villager that ran away faster and overall it looks better.
Careers could also be able to be distinguished by changing villager textures so they also wear hats similar to that of the Evoker in "Meet the Evoker" or the one worn by the Illusioner, and making the hats indicate the career, so that, for instance, librarians wear white hats while cartographers wear blue hats.
There should be a new fishing rod that is crafted from Nether materials and is used to fish in lava.
Fishing in lava only works in the Nether for the most part, with lava fishing in the Overworld only producing some of the possible items, most of which would be in the "Junk" category (Namely, the items found in Overworld lava would be those that are also available in the Overworld by other means, while the Nether-exclusive items would be the new fish and Nether items in the other categories); and it would produce different items in comparison with normal fishing. For instance, the fish found in lava in the Nether would be of different species, such as a fish that isn't edible, but can be used to brew potions of Resistance. Treasure itemc could include diamonds (Only found in the Nether. Likely wouldn't actually be in the Treasure pool), Metal blocks, or Wither Skeleton Skulls (Which would be rare enough that killing Wither Skeletons is faster); while junk items could include Glowstone Dust, Iron/Gold Nuggets (4-7), Nether Quartz (1-3), Netherrack, Nether Bricks (Item), etc...
This would make a few non-renewable resources actually renewable, and would also add other ways to obtain already-renewable resources.
With over 650 pages of small suggestions I'm sure this has been suggested before, perhaps many times:
There really should be a legitimate way to break bedrock. It should be quite expensive, maybe using a diamond block or something like that, so that you can't just run around breaking all the bedrock in sight. But the most important thing is that it should be a feature, not a bug, so we can be guaranteed it won't be "fixed" away in some future release.
Why would that be a good idea? Right now, the sole reason to break bedrock is to access the Void, so, unless new content was added as well, such as adding something to the Nether in the layers above 128, it would be pointless.
How about not command blocks and those type of blocks? That could really damage some maps, if the player got access to one of these explosives.
The implication was that the Nether above layer 128 should have content AND be able to be acessed without removing the bedrock layers.
Plus, the end result is the same as more powerful and more expensive TNT, and acessing it is controlled very easily, so it couldn't "really damage some maps" unless they were deliberately designed to provide the player with the needed materials; unless you're talking about multiplayer servers, where restricting it's availability should be easy (Just ban summoning the Wither or placing that block).
A block more powerful and valuable than TNT. Has a bigger radius of explosion and requires more valuable items to craft.
What about an explosive that involves Shulker Shells and Nether Stars to craft, and is less powerful than TNT, but acts like ALL blocks above layer 1 had 4 Blast Resistane or less? That would allow the Player to breach the Bedrock ceiling in the Nether, which, if done along with other additions, could unlock a second landscape that is only a bit similar to the "Lower" Nether?
1. It is. 2. That's not an argument. 3. That's an invalid argument. You could replace every mob with pink unicorns with that argument.
1: It is socially acceptable. It's not like cocaine, meth, or LSD at all, even through you're acting like including coffee is like including any of them to the game.
2: It IS an argument. More accurately, a counterargument, since your point in your argument was basically another form of "There's a mod for that", which is invalid because not only the game already has features that originally existed in mods, but goes aainst the point of making suggestions for Vanilla (At that point, a better question would be "Why does the Suggestions forum even exist if most of the features that could be suggested could be made by modders?".
Rotten Flesh should be able to be crafted into "Flesh Meal" that would act as a fertilizer a bit like Bone Meal. However, the difference is that Flesh Meal is used on the Farmland block, and causes it to temporarily make crops grow faster (It would last for 5 growth cycles, or, in other words, 1 Flesh Meal can speed up the growth of 5 plants consecutively), and that Flesh Meal also works on Soul Sand (Providing a reason to farm Nether Warts in the Nether, as Rotten Flesh is very easy to obtain there), Dirt, and Sand (Making it useful at farming Sugar Cane and Cactus).
Beetroots should get more uses, such as an ingredient for some sort of salad that involves crafitng it with fish and cooked chicken, which would have slightly less hunger restauration but more saturation than it's ingredients.
Cookies only give you a minimal amount of food points and almost no lasting effect (hunger starts draining faster again after eating).
Also: Cookies kill parrots, like in RL. That was made that way after people complained that children could kill their pets (in RL) by feeding them cookies after seeing it in the game.
It does give you a hunger effect. The icon looks green and rotten and unpleasant.
There are negative potions. The rest is magic.
You would be surprised by how many parents let their children do absolutely everything.
That's another point, yes.
Cookies are more efficient than bread in terms of cost-effectiveness, and feeding cookies to parrots is a lot easier to imitate than staying awake for so long with coffee (Unless their parents allow them to, as such behavior would be much more difficult to hide than feeding a parrot a cookie would).
As for Rotten Flesh, in hindsight I made a bad argument there. If anything, I should have put raw meat in general, except for raw chicken. And even then, cooking them is so cheap the only reason to not cook them is that raw meat can be sold to villagers, but not cooked meat.
Plus, within that suggestion, coffee could have diminishing retuns so sleeping is still needed at some point.
The main problem is the moral of it: "You are sleepy? Why not drink coffee instead of going to bed?"
So eating too many cookies should cause the PC to get fat, and be unable to sprint so kids don't think that it's a good idea to only eat cookies?
Or rotten flesh should instantly kill the player so kids don't think that eating food in a bad state is a good idea if they're hungry?
Or potions should cause some sort of downside to using them because they're the closest thing the game has to drugs?
It still is an awful counterargument, as it not only is contradicted by the game itself, but it also depends on parents practically not caring about their children, and on said children to think that Minecraft is somehow a very accurate representation of reality.
If anyhting, the real issue of the suggestion is that what happens if the player doesn't use coffee or a bed, or how it generally adds what clearly seems to be a mechanic that hardly adds anything to the game.
Redstone Cutters would "cut" Redstone Wire, preventing 2 Redstone wire "blocks" from transmitting charge towards each other, acting as if they were separate. This would allow for more compact redstone circuits, as they wouldn't need to have 1 block of space between 2 wires to prevent them from interfering with each other.
I just saw the Storage Boats mod, which gets you the chest (you can still ride it). The problem with most of the others is that un-ridden boats can't do all that much. (Also, the TNT boat probably couldn't break blocks, since it's in water.)
The TNT Boat is mostly for goofing around, as the most useful thing that can be done with it seems to be using them in PvP agaisnt several hostile boats, or for extreme squid fishing; but, since I'm not good at thinking uses for it, I guess someone will find a way to make it more useful.