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
I think this is a good thing. But I hope that they can do so intutitively. During the telescope guy recent review, he made a good point that many manufacturers seem to bring back buttons for compliance reasons or just to say they have buttons (he was trying to praise the car he was reviewing for going beyond that). I thought he had a good point.