You can ask anyone who uses them. Most people will say they feel like they're distracted and taking their eyes off the road while trying to navigate the UI on t

You can ask anyone who uses them. Most people will say they feel like they're distracted and taking their eyes off the road while trying to navigate the UI on their touch screen, and the remaining people overestimate their multitasking abilities. What is there you think needs proving? People can adjust the volume knob or AC without looking. You literally cannot do this with a touchscreen.