Apple found business value in providing an OS that worked well with their hardware. I imagine the System 76 team see similar value. I recently installed it on an old ThinkCentre, and have been very pleased with it.
Well, except for the crappy BT audio, but IIUC that problem isn't listed to Pop_OS.
Depends on if they've updated to PipeWire or not. PulseAudio/ALSA are terrible at negotiating Bluetooth connections, but PipeWire has been rock-solid in my experience. Since Pop is still on x11 they probably haven't updated yet, but it's likely coming soon.