Earlier quoted context omitted.
$20 BT would get you a proper BT phonecall experience but they wouldn't give you a remotely good music playback at all. BT have a lot of codecs but a $20 headset including tax and markup would not include all the fancy ones by the cost alone.
> BT have a lot of codecs but a $20 headset including tax and markup would not include all the fancy ones by the cost alone. What do you mean by this? AAC or SBC is perfectly fine for $20 headphones. Definitely for that quality of headphone. LDAC or Apt-X are pointless for a headphone in that price bracket.
I have some $70 wired headphones from AliExpress that literally beat anything I've personally tried wireless up to like $300 or so.