Sure, but its been, like, thirty years. The biggest advancement specifically Linux gaming has had in that time is a highly optimized DX interpolation layer from Valve (Proton, an extension of WINE).

The linux community seems to believe that the world will just naturally bias toward open systems given enough time. Maybe Vulcan will own the world in a hundred years; we'll wait it out. But there's no evidence that this is the case. People just want their problems solved; they want working games, or a freakin' powerful office suite, or whatever. That's why Linux succeeded in the server in the first place; it wasn't (mostly) its libre licensing; it was just better at a lot of things, which led software to be written for it, which entrenched its position.

We can solve problems and push for openness at the same time. Linux can have DX and HyperV and whatever, while we still make open solutions better. Vulcan may actually own the gaming world one day; its very good. But I doubt LibreOffice will; Microsoft Office is just too good. Why not try to do both?

Did Linux start out better at a lot of server things? My experience was it was just cheaper, and significantly so.

When my employer moved from Mac servers to Debian it was mostly slower performing and less obvious with the lack of a GUI.