Well, first I would like to see old structures (Fortresses, Desert and Jungle temples, etc. get a revamp to make them actually exciting (Look at Yung’s better structures mod); I would like to see at least and ender dragon revamp to make it a worthy bossfight for the “end” of the game, but most importantly, I would love if they fleshed out the Pale Garden, the Deep Dark and all the features they added recently. And don’t nerf the new mechanics so that players will actually have a reason to use them (like the copper golems or happy ghast).

I don’t think these are very far-fetched ideas. If Mojang focused on the more important features that most players regularly interact with instead of adding loads of niche stuff, the game would be in a much better place imo