IMO a touchscreen is a really lousy UI for a car.
You need real knobs & buttons that you can feel without looking. Voice also seems like a good option if it can be made to work reliably.
The whole design of this car is set up in such a way you don't need buttons or knobs.
Right hand control stalk : forward, reverse neutral park.
Left control stalk blinkers , second left co trol stalk cruise control.
Navigation, phone integration and internet streaming are under voice control
Headlights are fully automatic. Windshield wipers too if you leave em in auto mode.
Volume up down is left roller on steering wheel. Next previous are left buttons on steering wheel.
That's it. What other controls do you need ?
Drive height , steering stiffness and all 25 other things you never touch while driving anyway. You set those up once and never go back to the config screen.
Typical tesla drivers have the center screen set up in split mode. Top is audio source, bottom is google earth. The instrument cluster is set with the energy graph to the right. Navigation pops up left when activated.
There is nothing to distract the driver. It is not more distracting than regular built in nav systems. Actuallly it is less distracting as the nav sits in the instrument cluster.
Ive had mine for ten mo ths now. While driving i hardly ever touch the center screen. Only to change temperature.
The rollers on the steering wheel allow full control over everything. You can set those up the way you want.
In the model x the rollers are replaced with minii touchscreens. 4 buttons and touch gestures each. One left one right.