It's terrible having to input destination names etc without a (screen) keyboard. Screen + knob has been around for ages (e.g my 09 Audi) and it's great for simple things like scrolling radio stations but that's it. So for newer cars - yes it's terrible but there is no option. The safe solution is to stop to use the touch screen, just like you should stop to use the cell phone - but noone does that either. The design should be that there are knobs for a minimum set of features (climate, volume, ...).

Take this to it's extreme and you could make the touch screen read-only when the car is moving unless the passenger seat is occupied.