I did hear Rumours (I never looked into it) that there will be an upcoming feature in bluetooth that will allow for higher quality. I believe currently the tradeoff is audio quality vs latency. My bluetooth headphones (Sony) switch between high quality but ~500ms latency (guess), to low quality but no noticeable latency when doing calls.
True, Bluetooth 5.2 is introducing LE Audio that will use a new codec (LC3) and should enable higher audio quality also for calls when microphone from the headset is in use.
