If I may reinterpret this as a general BT codecs topic 
, here’s a curveball I didn’t notice when it came out: Audio quality of SBC XQ Bluetooth audio codec - Articles - SoundExpert
TL;DR:
- The SBC spec allows for way higher bitrates and sound quality than we’re used to seeing in mobile transmitter devices
- Once “unlocked” to work at 400-500+ kbps, SBC becomes comparable to aptX HD in human-audible sound quality
- Existing receivers/headphones already support such high bitrates, all we need to change is the software (OS) on our transmitter devices (links to existing patches in the article), and everyone could enjoy aptX-level quality without owning aptX-supporting devices.