I am over 70 and love technology but there is a place for physical buttons in cars and it just makes ergonomic sense. My Navigator has a great combination of physical buttons and switches plus a lot of on-screen activities. I can be driving and put my hand on the the console and adjust the A/C and other systems purely by touch. Having to touch the screen while moving is very imprecise, to me. I also find "talking to my car" more distracting than buttons.
Buttons can also be duplicated on touch screens for those that prefer them.
There is a happy medium. I like buttons especially for locking/unlocking the doors and windows, adjusting the steering wheel, cabin temperature, HomeLink, audio level etc.