Since I was using /e/ OS I was wondering, why there is only SBC audio codec available. Then I found out about licenses required to use them but since 2023 Qualcomm opened their aptX codecs and since then they are available in AOSP for everyone, even ROM makers: https://www.xda-developers.com/qualcomm-open-source-aptx-aosp/
Why it wasn’t implemented to this day? To be honest lack of bluetooth HD audio is a huge disadvantage over other ROMs and SBC is just bad.
Interestingly, I seem to have aptX on my OnePlus 6 (enchilada) with /e/OS 14, Version 3.0.4. The codec is at least shown in the Bluetooth and the developer settings when I connect my headphones to the smartphone.
Lack of codecs was showing up since I stared using /e/ OS so like end of 2023.
In my case codecs are shown up but they are greyed-out completely even when Qualcomm aptX device is paired with the phone.