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My personal experience is the opposite-- although this behavior perhaps isn't desirable for end users who don't want to fiddle with their codec selection, being able to switch between A2DP and HSP manually in pavucontrol provides me with a much superior experience compared to Windows which would a) keep my headset in HSP because of some rogue application with a stuck open mic and make it really difficult to track it down/undo it and b) (rarely) keep my headset in A2DP while an application is attempting to grab audio or switch it to A2DP in the middle of meetings and break everything until I restart the application trying to use my mic. In my experience, a manual codec switch is a much smoother experience, ironically.