With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
It’s not just about quality (AAC is perfectly fine quality-wise), it’s IMHO more about the extreme latency, and the fact that they have to to drop down to terrible-sounding HSP/HSP when using the microphone, since A2DP is monodirectional. Sucks that they don’t support LE Audio.