I suspect that the underlying reason that the profile switch happens, though, is because of bandwidth limits. That’s what Sennheiser is telling their customers,

I suspect that the underlying reason that the profile switch happens, though, is because of bandwidth limits. That’s what Sennheiser is telling their customers, at least. https://sennheiseruk.happyfox.com/kb/article/175-different-bluetooth-profiles-a2dp-vs-hsp/ https://sennheiseruk.happyfox.com/kb/article/175-different-b... The real answer may be more subtle than that. Maybe there is just enough bandwidth, but using it would have an adverse effect on latency, which bidirectional use cases are more sensitive to. Either way, the profiles were designed within constraints. They’re not arbitrary.