For some reason my iphone sporadically won't go back to "music quality" mode after cutting a call on a wireless speaker or car play, and it's incredible how bad music sounds with telephone quality.

The trick is to switch input to the laptop/external mic. Audio quality stays great. It’s kind of ridiculous that Bluetooth still needs the shitty lo-fi mode when the mic is on - I was recently surprised that this is still the case with modern headphones like it was a decade ago.