All of them i've actually wanted to try out I was able to stream via the xbox game pass website in a browser. It is not a perfect experience, but it is "good enough" on a decent internet connection. I understand that if you physically have an xbox you can also run the game on that and stream it to your linux desktop for much better performance and latency, but I have not tried this myself.

That said, it is pretty rare. The only ones I've tried that with were fortnite (a friend wanted to play the lego game mode, but it was short lived - starved for content, lol) and starfield (it was free on game pass and I wasn't sure I wanted to buy it).

I have a small windows install on a second SSD that I dual boot with. Most of my games work on Linux so I rarely have to boot over.

A "ez" solution would be simply stay on Windows and leave Linux as a novelty. A somewhat complicated solution -- double booting (apparently Windows can be a privacy nightmare even while dual-booting). A quite hard one would be installing Linux and running Windows on a VM with GPU passthrough. The "are you bleeping kidding me?" approach would be buying another PC just to run Linux while leaving your "main" PC for Windows.

"Is there a sane approach for this?" -- yep, there is! Which is, buying a console and use it solely for gaming while leaving your main PC for daily browsing and everything else (i.e Linux).

I have a Windows dual boot for the (nowadays rather rare) cases where a game won't run in Linux.

Interestingly, I spent a while trying to get League of Legends working with their new rootkit requirements... But my Windows-using friends weren't comfortable playing the game any more.

I was a total Rust junkie, I was playing 40 hours a week. Then they dropped support for the Linux client and wouldn't let Proton users do EAC. I had to stop cold turkey. But I fucking did it, because fuck capital-driven operating systems designed to exploit me and my own computer against me.