This would require the phone/app to know and be able to reconcile all the different configuration and communication schemas for all the different makes/models o

This would require the phone/app to know and be able to reconcile all the different configuration and communication schemas for all the different makes/models of cars AND for the cars themselves to publish what amounts to an API to allow for this sort of interaction. Nobody wants to do that sort of work on the phone side, and the car manufacturers really have no incentive to provide an API especially since they use their interfaces as selling points (BMW's iDrive, Tesla's 60" screen, etc).