I agree with you that car makers should stop trying to provide piss poor alternatives to our phones and instead acts as conduits for them and I remember things like PlaysForSure so I am much more in favor of an open standard like Bluetooth that doesn't live or die by one company.
I'm pretty sure the phonebook thing is OBEX. You probably don't want the car hitting your phone for the phonebook every time you want to make a call. IVI systems are slow enough as it is.
Yeah, I was reluctant to say Bluetooth because it implied that we should stick with existing protocols but that isn't exactly what I meant to say. Rather we should have some forward thinking protocol that works over multiple interfaces and is still open and platform independent like Bluetooth. Maybe even just a baseline Car Dock standard requiring Microphone, Speakers, and a Touch Display.
Bluetooth is just so encumbered with legacy concepts and limitations. It hosts a myriad of protocols that don't benefit users but are easy to implement to check the Bluetooth feature checkbox. There's a full generation of Bluetooth equipped cars that only support headset or handsfree protocols but not A2DP or other useful protocols people want.