Praise to Mazda for making this decision. As a User Experience Professional, I was never able to grasp the true user's need for touch screens in cars. For years I have been working on product interfaces (not just apps). Many studies I conducted actually told me that people favored analog controls over digital touch screens controls. It gives you tactile feedback, making it accessible for anyone with sense of touch. >…
Sturdy rotary controls which really are knobs are much better for a car. If you're on a bumpy road, the axis of the control will stabilize your hand. The controlling motion (twisting) can be more easily controlled, even if the bumps are trying to move your hand up and down. (I never see cars on the highway rapidly rotate about their roll axis more than 10 degrees. This only happens in Fast and Furious movies.) Furthermore, the feedback necessary to get from the control is all tactile. Contrast this with a slider control. An up/down slider is bad, because the control movement is in line with the direction of the bumps. Even a left/right slider has some problems with this, if your arm isn't perpendicular with the control.
Contrast all of the above with controls on a touchscreen. Almost all of the feedback is visual. Simply registering your hand on the control requires visual feedback. There is almost no physical stabilization of your hand in bumpy conditions. Instead, you have to compensate with a hand/eye feedback loop, which requires even more visual attention.