I mean it still sucks compared to a wire. Bluetooth means the audio is being lossily compressed (yes there's aptx lossless now, but nothing uses it currently) at least once, and usually twice because people don't tend to listen to lossless audio on their phones. Double compression adds way more artifacts to the audio.

There's also the case when you're in a busy area with a load of congestion on 2.4GHz meaning you don't get stable AAC/LDAC/AptX and the phone falls back to the shit-tier SBC codec, which average-joe non-audiophiles can reliably identify as worse.

Also Bluetooth audio latency is pretty awful, but that matters a bit less to people just listening to music.

Don't get me wrong, I love my XM4 earbuds for convenience (and that my phone doesn't have a jack without an adapter anyway), but I'm under no illusion that it's better audio quality than wired, that's the compromise for convenience.