Anything to make the game smoother. Like, the game struggles to maintain smooth fps even on good PCs, even with Optifine. I know it being such a resource intensive game, it's hard.. but look at how smooth Bedrock Edition is.

Other than that, I would definitely want the underground part of the game to get an overhaul, cuz it's the same everywhere it gets kinda dull and monotonous. Underground biomes and structures and such would be amazing :p

I would add in better A.I. for the villagers and pets, NPCs with scripting for conversations, quests and other configurable uses, thatch and other types of roofing materials, furnishings for abodes and a lollipop.

I would add a higher height limit for building. 256 is too short.

Lag issue's, graphic errors (Especially shadow updates because they are glitchy as butt in 1.13+) And I would add a command to turn off the 1.9 combat system.

There are a lot of things I'd like to add to the game, like seasons, more mobs, vertical slabs, more mobs that can be your pet/pet amulet of some sort, optional shaders, and the option to change your skin while logged in. That last one might already be possible and I just haven't figured out how to do it.

I would add guns and fallout shelters.

Make mining more fun

A more developed system of ores, more metals, and far more alloys for making equipment. I don't want this to be like Terraria, but come on... We have few materials

would add back references to notch

I'd add more decoration blocks and stuff. New kinds of trees (like cherry blossoms), new lights/the ability to change the color of light sources, lighted signs, etc. Even though it would completely destroy the physics of the game, I'd like to make everything rely on a base. So if you blow up the bottom of a skyscraper, the whole thing would fall. There wouldn't just be floating blocks in the air.

Great poll, by the way. It really has me thinking.

i wanna add sandwiches

I'd probably add a texture/resource pack editor, turn jsons back to lang files, add pizza, change the combat back to what it was in 1.8/1.7.10, turn back the changes made from The Flattening (which is a stupid name by the way), and add other gem ores into the game (Like Peridot and Ruby). Then after doing all of that, I'd be like Notch and won't update the game anymore with pointless additions unless someone makes a reasonable request.

give everyone some dummy thicc butts

I'd try and change the height limit if at all possible

That won't happen to anyone.

Add stairs and slabs for concrete and glass.

Let monsters have villages and new villager monster types: Skeleton, Spider, Pigman, Blaze, Ghast, etc.

Anything normal that players request

i would make the debug stick the infinity gauntlet

i would make an option if you have cheats on to do /fly so survival or adventure players can fly and the operator can set a kinda spawn so if you do /hub it will tp you there, instead of getting plugins because minecraft realms cant get plugins, also a /summon hologram then 'text' and the cords. i think this stuff would be awesome

Make all these Mods, Datapacks, Texture and Resource Packs Java Minecraft Integrated.

VoxelMap Mod
Transporter Core Datapack
Tables and Chairs V2 Mod
ZCBM Guns Mod
Valkyrien Warfare Mod
Rope Bridge and Zipline Mods
Pirates of the Caribbean Texture and Resource packs
Conquest Reforged Texture and Resource packs

Add far more sea life, dangerous sea life.
Add more land life like Apes, Reptiles, Cats like Lions, Panthers etc More Danger.
Option for Creeper spawn prevention.

All this integrated.

As far as I know, Jeb calls all the shots & the developers just do as they're told.

Prioritize performance over bells & whistles (and gongs & chimes).

Quite wasting time and resources fiddling the textures: what is there works, those that don't like them can change them easily enough… and there are a myriad of artists producing new ones (for free, which is a hard market in which to compete)

Switch to releasing any changes that 'require' changing basic mechanics as official mods rather than writing changes to MC physics into vanilla.

[All of which is more nearly based on the presumption that MS puts Mj on the block and I have a spare $2x10^9 in the hobby jar, than getting a job with the firm.]

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A reasonable real modding API, not just datapacks.

Make a world gen option to allow a special world gen that uses a storage style like the cubic chunks mod.

A new ore type (maybe alloys too)

And 100% a new dimension with a portal that has a rare chance to spawn in end cities.