A lot of people send and read phone messages while driving. I highly doubt that same people gives a second thought before playing with the screen while driving, unless they are under a real stressing situation (pouring and twisted road at 2 AM).

If the choice is between

1. Physical controls that you can interact with without the need to take your eyes off the road

2. Touch screen that you need to look almost every time, much of the time while actually interacting with it. But you can mitigate that by using it more responsibly, waiting until you are at a stop, our out of range of anything you might need to react to (which might not happen for 10 minutes or even longer)

Then #1 is clearly the winner. Because 2 is more dangerous for everyone on the road (not just you with your own behavior, but everyone else that might act irresponsibly and hit you). We specifically craft laws to make people interact with their phones less (hands free only, etc) because "people must act more responsibly" is not a reliable solution.

Exactly. That is why physical buttons you can use without looking are so much better. For the perfect driver it does not matter so much, but that is a rare species.