The regulation calls out 19 vehicle functions which must have physical controls inside the vehicle, with additional requirements about size and usability of the buttons.
Those functions include:
Turn signals
Hazard lights
Horn
PRND gear shifter
Driver assist function, if present
Windshield wipers
Windshield defroster
Power windows
Emergency call system
Power off switch for EVs


Removing buttons is an idea. An idiot idea, but certainly an idea.
I don’t love the idea of having to regulate for fuckin buttons, and think it should be avoided if possible, but I guess here we are in hell, anyway.