I used several GCam mods on LineageOS bluejay and tested it along with a Stock Pixel 6a side by side, and the quality was identical in my eyes. Somehow oversharpened by the app as many have noticed, and somehow the pictures on the Lineage device where a bit brighter, therefore looking a bit better to me.
Using the open source camera apps on bluejay, the quality was not comparable.
Seeing as how official support seems to be delayed/in hiatus, I decided to give it a go and build it myself (successfully). I'm going to test it and try adding a tweak to allow OTA from a private source so that it can be updated without a computer later. Otherwise I'll be leaving it at stock so that the switchover (if the day comes) is easy.
In the past I've built unofficial lineage ROMs for the Droid Turbo/Moto Maxx, Pixel 2XL, and Oneplus 8 Pro. This seemed to go just as easily, so wish me luck in the build working . I'll be sure to share it if all goes well.
Quick update for those following - keep in mind the link I have above is to the lineage - dev version, so this isn't even a "nightly" much less a stable build.
That mentioned - it's was about 99% there for the features I use. The only bug I found was sometimes, unprovocted my screen would just turn on lol. I turned off all features in settings, notifications etc. including turning off the lock screen etc - but it'd still happened.
Even with this the battery life was really good for the way I use the device and standby was like .5%/hr. -that's about as good as I ever get.
Once they publish this out as a nightly it should be good for the masses.