Physical buttons I'm fine with. It's the capacitive/swipe buttons. They're far too easy to accidentally activate, since they only require a touch, and they're in the one spot of your car that you touch the most often.

Critical functions, so things that effect how the car cars, should never be on touch buttons. There is too much wiggle room with them consistently activating when you expect them to. If you want to put non-critical components on touch buttons, so things like radio, AC, locks... Fine. I don't prefer it, but at least you're not creating a hazard. Acceleration, deceleration, steering, braking, and safety should NEVER be on a capacitive sensor.