[Causality1]

if you instantly play the music you were listening to right before the call by clicking the play button on your keyboard, your music will play at a lower audio quality

I don't recall the names of the specific bluetooth profiles, but I wish Airpods and bluetooth headphones in general gave you more control over this. Sure, the older headset profile is noticeably lower quality but it's also virtually lag-free. I have a shitty old headset I use when gaming on my phone specifically because there's no noticeable latency.

[Nextgrid]

It's AD2P vs HSP profiles. One gives you good (well, compressed but decent enough) stereo audio one way, one provides shitty audio but both ways.

I'm surprised as to why Apple couldn't come up with a better protocol that would manage to do both or switch number of channels & quality seamlessly.

[Causality1]

Nobody seems to care, is the thing. Qualcomm is now deprecating APTX-LL in favor of APTX-Adaptive even though it's 50% laggier even under ideal circumstances.