Touch screens are great for dynamic interfaces, but terrible for anything that involves feedback or a tactile experience.

My vehicle - though not a Tesla - still pisses me off that all the stereo controls except the power button are touch-based (even power appears to be a software-activated button as it failed once when the unit locked up). The saving point on my vehicle is that the steering controls (volume, prev/next) do still exist as physical buttons.

At the very least, they're should be a physical on/off, and physical dials/controls for volume and heating adjustments so a driver can change those without taking eyes off the road.