And that's why Android Auto (and possibly CarPlay) are just dumb streams from the device to the car infotainment system, and input streams back. The car doesn't

And that's why Android Auto (and possibly CarPlay) are just dumb streams from the device to the car infotainment system, and input streams back. The car doesn't need to know what's on screen, and the phone doesn't need to know the capabilities of the infotainment system.