They are not necessarily applicable to everyone, but most of the time they are accurate. Makes it easy to see whether setting it all up under Linux is worth it for your library.
Only problem with Linux gaming is that you don't get stuff like fan, voltage, frequency control for newer AMD hardware. This hasn't been an issue for me until I got a 6800XT. I thought about RMA until I remembered their Adrenaline software exists. I wish I could save my settings to the card's BIOS.
I no longer use this machine for anything but gaming. Going back to windows sucks
All games I want to play these days work under Linux without effort. Older titles work even better where under Windows you could run into compatibility issues not so under Linux because of the great effort put on backward compatibility by Wine.
Also, a bit susprising and unfortunate, the Windows version of a game that has native Linux support often runs better.
I run Manjaro Linux and have an Nvidia GPU for if it matters. My Steam games I run with Steam and for the games I bought on GOG I use Lutris.
I would really suggest people to check out how far it has come.
This application lets you adjust everything and the settings are saved on reboot