“So many happy CarPlay users” is not really quantifiable in any way, is it? Quick searches reveal lots of people have been experiencing issues with CarPlay for years, and people don’t write lots of online articles on “how to fix CarPlay” for no reason. Connection instability, freezing, lack of/slow response are all common gripes.
The truth is the car is just one variable. The hardware varies among iPhones out there. The iOS version varies. The CarPlay connection method to the car varies. These are just some of the reasons not everyone is excited about the prospect of a new version of CarPlay in their cars, or at least question the value added by CarPlay with regard to functions the vehicle already performs like speedometer display or HVAC controls.
No system is perfect. Let’s not pretend Apple’s implementation of CarPlay, of all things, is.