Is it only through the skin? I could see it being useful for some sort of implanted medical device/monitoring system.
That way you have something subcutaneous but the power source is strapped to the outside of your body so you can remove for short periods of time to wash/recharge it.
Personally I prefer a mixture of both. Touch screen for anything you don't need to operate while driving and physical for everything else.
Android Auto navigation, car system/audio settings, clock and system management, etc should all be a touch screen so you aren't navigating through turning knobs and pressing up and down buttons to go through various menus like your programming a microwave.
Knobs and dials and buttons for anything to do with audio volume, skip/reverse tracks, etc. and air conditioning.