i would really love minecraft to be a tad bit more realistic to add more ''logic'' in the game so users would not have to go on the wiki and can just '' trial and error '' in the game as that was my most enjoyed part of the game such as the smelting of ores and most of the crafting... i would also like a bit more features in the game, but simple ones

- sheep and wolves also providing meat ''food'' instead of just pigs, chicken and cows as sheep and wolves are also made out of flesh... (haha sheep chops) still thinking about the name for the wolve meat...

- an enhanced mob AI such as like mobs being attracted to certain blocks, items, light or darkness or even other mobs
example:
the zombies being attracted to items in entity forms like raw pork or beef or hopefully in the future, lamb chops XD

the creepers being attracted by TNT (just an idea... i think its stupid too)

the wolves being attracted to jungle cats (chase them XD) and them you would have to go and chase your pet wolf back as it attempts to kill the wild jungle cat like a real pet

the wolves being attracted to go out/ spawn in a full moon

creepers would be attracted to blowing up chests ( pissing off players )

magma small magma cubes or slimes would be able to come together to form bigger ones (but only a period of time of like 2 minutes if had they been sliced apart by players or not) to make slimes and magma cubes a bit more tough

wearing the newly implemented mob masks would cause mobs depending on the mask to ignore you thinking that you are one of them while other mobs (mobs that are not the mob mask that you are wearing to attack you normally for example if you were to wear a creeper mask, creepers would ignore you while other ones still attack)

the potions to have full affects on mobs too, like the night vision potion would allow mobs that are affected by it to have a greater radius of detecting you
and
the blindness potion which would cause mobs that are affected by it to have a less radius or detecting you

iron golems avoiding water and rain as they will rust
rust= causes brown surfaces to appear on the golem
as more and more of the brown spots of rust appear on the surface the golem would slow down more and more as they increase. when he is fully covered in rust, he would slow down to the point of stopping, and on the spot, turn into a rusty statue of what was an iron golem...

and armor affects in different environments
like if you have iron,gold or no armor a snowy biome you would have a slower walking speed or will shiver causing your screen to giggle around as the metal armor conducts heat making you cold and the only way to avoid it is to be in about a 15 block reach of fire or wearing 3/4 parts leather armor

being able to hang clocks on walls without the use of item frames

(this one i have always dreamt of but i know not possible)
to be able to see ravines forming XDXDXD