CarPlay is also probably a limiting factor. There are a few options for wireless CarPlay, but it seems the vast majority of implementations still rely on the cable. I doubt Apple would be willing to effectively kill such a feature with so much investment and partnership, and without an effective and equivalent alternative available.

Sounds a lot like the headphone jack now that I type it out, but I guess ‘if you want to listen to music, buy Bluetooth headphones if you haven’t already, or use the adapter’ is easier on the consumer than ‘if you want to keep using carplay, buy a BMW.’