I've been using the Apple CarPlay touch interface for about four months, and it is highly overrated. Here's some real world feedback:
The functionality is great, but forcing me to extend my arm to find a touch target while navigating traffic is not easy to do. Better solution: integrate with the various selector pads (like the big BMW joystick/wheel or the Mercedes touch pad) combined with tactile feedback when you hover over one of the icons would be much better.
Another problem with the interface is bad usage of the screen. The initial array of icons can't be rearranged, forcing me to keep app icons on the home screen I don't want, and relegating a couple of my favorites to a second screen.
Once you enter an app, the only interface option for selecting content is a scrolling list, which can only show three or four items. Instead of a scrolling list, I'd really prefer a grid of icons for the content, which could show many more choices on the screen. At least fifty year old AM radios gave you a row of five or six presets — only one click needed!