For the Model S/X (and I believe the 3 as well) the roller knob on the left of the steering wheel is tactical volume control, and the one on the right is configurable with tactical buttons to control cabin temperature, screen brightness, fan speed, and a few other things too. Highbeams are controlled by a stalk to the left of the wheel, and I've very rarely needed to set the main headlights to anything other than "auto".

I think if you wanted to own a Tesla and never use the touchscreen while driving, it would be entirely possible although you wouldn't get access to some infotainment features that many other cars don't have anyway. With voice commands, though, a lot of those would work anyway.