Haven’t watched the video yet but I’d like to add from my very limited experience. I recently switched to Kubuntu (still have my windows boot) and the one game I play (Red Dead Redemption 2) seems to be running worse. I haven’t done much testing at all so it could be something I can adjust and get running better.
Having said that, general day-to-day performance is miles ahead of my Windows install.
If I could get RDR2 to run better on Linux and DaVinci Resolve to run I’d have no need to keep my Windows install.