[jws]

UWB would provide plenty of bandwidth at close range with better energy efficiency, but it will not match bluetooth for distance. With sufficient software complexity you could switch back and forth between them depending on conditions… so that sounds like a business decision on cost to implement and benefit.

Or some clown has a patent conjoining some aspect of UWB and audio, or protocol switching. Apple never says "we don't do this because there is a patent in the way". It isn't their image.