I think cars should not be dependent on a touch screen for ANY of it's functions (or really have one at all). They are more difficult to use than tactile buttons, distracting, and do not receive long term support from the OEM.

What do you do with a 10 year old car that runs but the touch screen nuked due to age, firmware bugs or mechanical damage? Ford isn't going to be selling replacement units 10 years later and I have yet to see an 'infotainment' system that has aftermarket replacement considerations.