Nobara OS, Arch Linux and Pop!_OS beat Windows 11 by a slim margin in fps (delta 8) in Windows native games - Cyberpunk 2077, Forspoken, Starfield and The Talos Principle II. Windows 11 wins in Rachet & Clank.
ComputerBase’s testing was done on an all-AMD test rig, featuring a Ryzen 7 5800X (non-3D) and a Radeon RX 6700 XT.
Update: Windows 11 wins in one game.
So many errors in what you’ve said. Valve made Proton with the developers from CodeWeavers who make Wine, quite literally investing in the developers and development of Wine itself. And given Valve upstream everything, your comments about forking, back porting, etc are quite ill informed.
That’s why they were posed as questions, and not statements. And I also quite clearly stated that my understanding may have been wrong.