"I, like anyone who hasn't just passed their test and is an average driver, can readily glance at a control and press it even if it is on a touchscreen"
Wrong.
You can feel for switches & button without taking your eyes off the road.
And there's feedback.
You have to look at a touch screen to use the controls on it.
Touchscreens don't belong in a cars.
HUDs, classic switchgear and maybe voice control are the only acceptable safe methods of fiddling with gadgets in a car.