When talking about GOS camera quality keep in mind there was a change back in Version 56:
Notable changes in version 56:
- use Latency mode by default for fresh installs instead of Quality mode: Latency mode doesn't wait for 3A convergence (stable auto-focus/auto-exposure/auto-white-balance), defaults to 95% JPEG quality instead of 100% and uses HDR+ on Pixel 4 and later instead of Pixel 2 and later which doesn't matter much for fresh installs since Pixel 3 has been end-of-life for over a year
I had my GOS install done before this update and so fiddled around with the setting and tested it out and manually put it on latency priority. I found that Latency really improved how fast it took photos after hitting the shutter button but you are more likely to get less awesome photos as as a result. Since I have my phone set to launch the GOS camera with a power double tap and generally want to snap really quick photos this setting is perfect for me and I use GCam for anything I'm willing to take a couple more seconds to capture and care about the quality of.