Having driven with the Tesla touchscreen, I can tell you you don't need to use it much while driving. The dials in the steering wheel can adjust the temperature, voice control is great for navigation and for selecting music, and range, performance data is on the dashboard (for non model 3).

If you need to do something complex like select a destionarion on the map, I don't think there's any interface that would let you do that safely as you need to visually identify a location.