CarPlay is an apple product that is only effectively a screen share to the car's display from the phone and not integrated with the electronics of the car. . It's well documented how car play interfaces with the manufacture. It's not a sestemic issue and only impacts users with phone or phone software related issues.
@FordTechOne has a lot of insight as well
The phone sends a H.264 video stream of the UI to the car, and the car sends back x and y co-ordinates of screen touches. This is how Carplay keeps working across iOS upgrades without having to upgrade the car's firmware.
CarPlay is a smarter, safer way to use your iPhone in the car. Learn how CarPlay works and how to design your car's infotainment system...
developer.apple.com
Learn how CarPlay integrates with your car's infotainment system. Understand how CarPlay is designed to work with your car's resources...
developer.apple.com