This is what I came to the comments for. The post didn't mention price a single time. It's not that expensive to retrofit CarPlay into any vehicle, and a 166% delta is hard to explain away with a single feature that can be retrofitted later.
So the numbers check out and there's no need for you to find the blame elsewhere.
Ask that 79% of car buyers if they would forego carplay for a $10-20k discount.
If the software is as good as Tesla's, I have no need for CarPlay. Having to buy from a dealership and spend a few hours there, having to pay monthly for software features like maps/remote start/phone key, and having to deal with ICE stuff ended up being far bigger issues.