If we are talking about embedded software and firmware that runs sensors and controls that have to do with powertrain or driving, I think that has to be part of the car itself and not rely on a connection to a third party device.
So maybe Apple’s strategy involves partnering with car companies on embedded systems, and then also defining a wider interface to send info back and forth between the car and phone.
The part about car play taking over the screens sounds ok from a safety perspective, but not so much controlling things in real time. The car would obviously need to be able to run the screens without an iPhone, and immediately fail over to that default.
And Apple has their own silicon and hardware engineers. Maybe they want to provide the actual hardware behind the infotainment system as well. Your car could have “find my,” and have seamless interaction with your phone in your pocket.
I guess then it would come down to personal preference. They probably won’t play nice with Android auto, but the all-Apple experience will probably be very solid. That’s generally what they do. They limit options and piss off a bunch of us computer literate people, but if you are willing to use their integrated product their way, it’s generally good.
It would probably also generate a lot of sales if put into some entry-level luxury cars. Like the type of consumer that literally does see their always-new iPhone Pro Max as a status symbol.