I completely agree with this. The concept of having a single function in the car (wipers) but two different places to control the function is distracting and not intuitive. You would not expect to have a switch for headlights on the dashboard but have the parking lights/high beam controls on a touch panel. It simply takes too much time away from what you are supposed to be doing, which is watching the road and driving.
I recently got a minivan with a touchscreen to control the radio. While it's cute, its actually really difficult to use. 1) I don't know what I'm pressing on the screen, or what menu has come up, unless I take my eyes off the road to look at it. 2) This is the worse part. It takes a long time for screens to change and the buttons to do their job, like half a second. That's a long time, and that means I'm potentially ignoring the road for half a second. Unless the passenger is controlling the radio or I'm parked, the touchscreen serves no purpose.
From a UI perspective, nested menus are not good for doing things quickly. But, maybe Tesla is pushing everything into the touchscreen because they anticipate not worrying about distracted driving as their self-driving cars take off. Maybe that's the point.