This is one of the infuriating things to me too, yeah. On the one hand, Bluetooth is a horrifying mismash of all these special-purpose protocols rather than a generic pipe. But then, when I want to take advantage of the fact that it's not a pipe and that I'm shipping down prepared audio (rather than live audio), which is something one of these specialized protocols ought to be able to negotiate, suddenly Bluetooth is just a dumb pipe relative to this use case. It's the worst of both worlds.