Ok, but the iphone isn't remotely the same situation, work load, stress or risk; compared to a car.

I relatively consistently mistype on a touch screen keyboard. That's not too much of an issue.

However, me taking my eyes off the road in a car, (stationary or not) to fiddle with a touchscreen is a major risk. I personally just enjoy the fine tuning I can do with physical controls. And the best part, I don't need to look at the control to use it. With a touch screen, sight is a requirement.