I'm not calling you a liar, but what you wrote is not true. Caveat: It's not true about the US.
Fact - Every major car maker in the US is signed up as a CarPlay supporter. Toyota was as well until this announcement, and they are still on Apple's website.
Fact - Unless you walk into a Ferrari dealership and buy an FF, you can't get CarPlay. Honda/Acura has limited connectivty through Siri Hands Free and should upgrade to full CarPlay later this year. Hyundai should be the next to intro it by the end of the 1st qtr.
So no one walking into dealerships is being told the dealer doesn't support CarPlay. They may say it's not available yet, because it's not. Why would they say that when they're all signed on as supporters?
Based on what you said an Apple follower won't be buying a car anytime soon.

Japanese car dealers are the worst? Where, Japan? Cuz here in America, those dealerships are owned by the same type of guys who own dealerships of other brands. Often dealers own several different brands.
Your post is disturbing.