Don’t get me wrong. Apple removing audio jack was the biggest facepalm in smartphone history. And you can thank it for not being able to make an upgrade without sacrificing audio jack (and SD card too :/). But USB-C is getting standardized everywhere now (laptops, smartphones, etc.). What makes USB-C earphones not worth the switch?
Your last point is just how Bluetooth works. It’s not to do with the headsets being cheap. When two way audio is used over Bluetooth, quality drops dramatically because it becomes more compressed.
I think they’re fixing that with Bluetooth LE audio but I’m not sure.