Animals shouldn't drop so much goddamn food
Biomes should be larger, large enough so I can't run for 5 seconds and reach the other side
Thirst and water bottles or something similar
Biomes should affect players conditions along with weather, eg: deserts make you thirstier or hungrier faster
Hostile water mobs, preferably ones that can destroy boats
fudsfsfhsf testificates the forgets
Dirt with grass on it should burn as well, but not destroy
More variety of weapons and fighting should be improved in general
Materials should be harder to get on harder gamemodes, like longer destroy time and less drops
Bone meal should only make wheat grow, and only 1 level higher
Just some stuff that I think should be improved or integrated into the game
1: I don't see how it's too much.
2: This isn't Earth. What if this planet logically has biomes like that?
3: That could definitely break a lot of maps, systems, etc. Having to keep track of 10 different bars for the most trivial things almost no other game deals with. Hunger is enough.
4: Giving a biome constant negatives is a
very bad idea considering
generation code changes. You might build in a nice plains and the next update, your house is in a desert and you're dying. It's bad enough when your home becomes a snow biome and everything freezes.
5: This would make traversing oceans impossible. You would loose all your boats mid-way and be lost unless you think you can go all the way down and up in time.
6: What about Villagers? Is there a problem?
7: If it is around lava, it can randomly start to burn. Then again, anything can. Regular fire doesn't spread across grass, it really shouldn't unless under extreme exposure. And then, not a lot.
8: "Improving" combat and adding weapons usually results in someone building a bunch of extreme weapons and killing everyone pretending to be a god.
9: No on the Longer Destroy Times. Why would it take longer? But yes on the drops.
10: Bone Meal is required to grow Giant Mushrooms. Considering how many people still haven't even seen a Mushroom Biome, making it impossible to create any of it's features at home seems like a bad idea. Especally if you factor in destructive sea creatures breaking your boat as you search for a Mushroom Biome.
Some points I care more about than others. Mainly the longer responses...