Running a Fairphone 4 with IodéOS (another de-Googled privacy focused Android) for close to two years now and I agree that it's a capable phone which doesn't limit myself in any way.
As you mentioned the biggest downside is the camera, which apparently has something to do with the firmware.
Edit: regarding the headphone situation: I'm using Austrian Audio (=former AKG engineering team) Hi-X25BT headphones, which are noticeably better than pods or cheap headphones and have been running well over a year now. They come with both (mini-)jack to USB-C and USB-C to USB-C cables, but I haven't tried the latter yet.
Iron out the bugs? That would be an improvement compared to Skyrim.