In my opinion, I also find that the graphics quality in VR has significantly deteriorated compared to 2.8. I have tried all possible settings, but the screens and especially the writing seem blurred, and overall the quality of the display has decreased. Units smear when I quickly change the viewing direction, and especially the sharpness of the writing as well as the screens and HUDs has suffered greatly.
It can't be that I install a new update and then I have worse immersion than before.
For all who doubt my hardware: RTX 4900, 7800X3D, 2x4 TB Samsung 990 Pro, ASUS 670e-e Gaming Plus Wifi. My VR is not a Pimax, but basically, it doesn't matter, because as described, I had a clearer picture before the 2.9 beta update, and in the stable version, I still have a clear picture, as it runs on 2.8.