Neither will I buy a care that does not even offer standard CarPlay, nor will I believe a company that developes his system in cooperation with google, that CarPlay is intrusive.
Well look at Tesla.
I think there is a difference between a Car makers supporting multiple platforms, particularly localized to media, and supporting a complete OS taking control of UI of the vehicle and its experience.
Considering Apple's approach "predatory" to the digital market as a whole, ver closed wall garden, it's quite understandable that support to new devices and OS will be refrained were well established brands are concerned.
You seem, Google pays billions to Apple just to be the default search engine. Something that Apple can easily swap with a touch of a button. But once and if Car Play Ultra becomes popular, Car makers will not be to simply switch.
Look at your attitude. Before Car Play you used to buy cars, no problem. Now, for you Car Play seams to be more important then the Car itself. Even though in reality, developing a Car and create a business around it is way more difficult. Apple could not for instance.
I think it makes more sense for Car makers to offer the car with an 'API" were digital entertainment units can plug in ... much like it is now. Like a Platform.