So instead of trying to look at a tiny screen that’s clipped onto an air vent, I can use the screens and integrated controls, keeping my hands on the wheel and my eyes more in the road.
Also, the biggest battery drain is having the screen on. CarPlay allows me to have the screen on the phone off while still accessing all the data. With a wireless adapter, I can also leave the phone in my pocket, so I don’t need to set it up every time I get in the car or remember to grab it when getting out. So it feels more like the native experience of using the car.
I don't know that I believe that.