Break natural leaves while you ride a horse

Repair elytra with leather (and disable phantoms)

Removes baby zombies

Craft a bed with mixed wool colors

Removes Granite, Diorite, Andesite, Tuff

Endermites don't spawn when using Ender Pearls

Revamps the core mechanics and removes the bad features

Removes EXP and revamps the enchanting system

Removes copper, with iron replacing it in the few "uses" it has.

Removes infested blocks