clearly (given all the other responses), there are a bunch of different conflicting requirements which lead to different protocols. as for your bluetooth issue

clearly (given all the other responses), there are a bunch of different conflicting requirements which lead to different protocols. as for your bluetooth issues, PC bluetooth is a mess. some of bluetooth's messiness comes from having the higher level elements of the stack designed 20+ years ago to operate on microcontrollers of that era. they've got N different audio profiles because the hardware it was expected to operate on originally would've been hard pressed to handle a single audio profile that could negotiate the gamut of use cases.