There is no discernible difference to me between using a builtin touchscreen and a phone. If one is distracted driving, then so should the other. You have to take your eyes off the road to use both, and with physical controls, I might glance it it but most of the operation of them is done by braille. If I pressed a button, I know I pressed a button and I pressed the right one, I don’t have to look back at it to know that. And if I have to follow it up with another action, my hand already knows where that control is relative to the one I just pressed.
The only thing I could live with on touchscreen is music or diagnostics since neither are particularly necessary when you’re in the act of driving.