What would you like for minecraft features?

Out of interest I wanted to ask what you would like to have in minecraft and what else you have for minecraft. Please only nice and serious answers

Firefly.

Sailing ships for different team sizes which are also big or small depending on the size. But there must also be one thing that can be controlled alone

That mountains are green again and full of trees like in older versions. This would be my biggest wish.

And otherwise:

Vertical slabs, so that not everyone misuses the trap doors
A gamerule to display phantoms
That you can change the F2, F3, etc. Keys
A friend list like LabyMod and co.
Cooler caves, with stalagmites and glowing crystals
Undo-Command to undo commands
Tame dragons
Cooler Mobspawner rooms
Two players should be able to ride a horse
Seated dogs should wag their tails when their owner approaches them

Transfer images to banners in local storage
create custom inventory without mods yourself
vertical slabs
undo and redo Command for Vanilla
LORENBLOCK (has always been my wish since I started working with Redstone)