Fully agree, same here. It's just sad to keep watching this, because now just after approx. 15 years i started to evaluate the Linux Desktop again and it failed again. Many professional software like Maya, Houdini, Unreal, etc. that used to run great on Linux/X11, now sucks on wayland. Some are hyping Linux for the subpar gaming compatibility, while for GameDev Windows is still required. In 15 years I'll try again, but then I'm probably to old for this.
Or they say it isn't, but then from which OS are the games that make using Proton a requirement?
They aren't targeting Linux, they are targeting Windows Game Developers Kit, even when the engine is actually cross platform.