I can kinda relate to this since I'm a bit of a n00b even after four-ish years of playing the game, mostly because I do a lot of stupid stuff like jumping into a group of monsters thinking I can kill them all.
That being said, I think I'm the exception to the rule. I also find that people who think the game should be easier tend to say it's too hard for their kids. That's fair since Normal and Hard exist to make the game harder, so why shouldn't Easy be easy enough for the lowest age demographic the game appeals to, namely 10-year-olds?
Alright so what about these changes?
-ALL Mobs should have less health on easy difficulty
Eh... Maybe on its own, but I wouldn't do that in addition to all the other additions.
-ALL Mobs attack speed should be lower on easy difficulty
-Skeletons should fire bows WAY SLOWER on easy difficulty
-The drowned should spawn a lot less on easy difficulty
Hmmm maybe? I haven't had a lot of experience with drowned yet, but I do think the fact they spawn in any water with a light level of 7 sounds annoying.
-The drowned guys that throw the harpoon should fire WAY SLOWER on easy difficulty. They practically have a machine gun with auto aim.
Again, haven't had a lot of experience with these guys yet so I'll have to take your word for it.
-Food depletion is ridiculous on easy difficulty. Each single time we fight a monster, we have to immediately eat right after it or we will die when the second monster comes to fight because our hunger is now so low from replenishing our health.
Food depletion in general is kinda ridiculous, so you're not alone on this one.
Now, in defense of Minecraft as it currently stands, I don't think even in Easy mode monsters should be incompetent. But I do think they do deserve a little bit of a nerf.