This would inevitably put the manufacturer in a bind though. You'd have a pile of pissed off customers standing in a line one morning for you, because Apple or some third party pushed an update that suddenly makes the product incompatible with your car, and they'd be screaming at you about it. You'd have techs piled around a car scratching their heads, like is it the car that's fucked up, is it the device? All without knowing that some third party has randomly done something unbeknown to the person who is scratching their head trying to figure it out. It's frustrating when your Android Auto isn't working suddenly for reasons like this one, this I personally know all about. But could you imagine if it was suddenly the whole dashboard that wasn't working?

Also it beholdens you to third parties to provide solutions that you can't really control from a quality standpoint, but any quality or compatibility issues will 100% affect the customers perception of your product. For example, "I can't get my iPhone to work in that piece of shit car, I fucking hate that far so much," because they can't control the car suddenly either.

Don't get me wrong, your idea is neat, and it would be cool if you could get that all to work, for sure. But it's also fraught with peril, you know what I mean?