Although I have a work around, I tried to find root cause on the distortion I see when using SteamVR. Can't figure it out

User Support Hub Virtual Reality (VR)
16

YT videos are more often that not honey pots for clicks unfortunately.

Instead, you might want to read this discussion, it might help you (or not):

My 2070 SUPER VR settings and suggestion (Reverb G2 - WMR)