And sometimes the Windows version runs better under Proton than the native Linux build due to the port being so poorly done which is kinda funny.
Occasionally I do still run things under Windows though like Cyberpunk 2077 as I got about 15 more frames under Windows which let me bump the graphics up a bit more.
Or Assassin's Creed Mirage which got me double the FPS somehow. Currently playing AssCree Shadows on Windows too as it just refuses to run at all via Proton. Other people seem to get it running fine so I dunno why I can't. Ah well.
As much as linux for PC gaming has made huge strides over the past few years, it seems really hard to avoid having a dual boot to keep windows available if you're serious about the whole breadth of available games. Or if you want to avoid pitfalls on those titles that run with a list of caveats, you can go exploring on protondb and some games need a collection of commmandline tweaks to get going well. It'd be nice to have a better experience for enabling those or opt-in to commonly used configs on particular games
Maybe I'm cheating by using a 1080P monitor, but I have only ever installed Windows once and that was for Starfield since it didnt work with Proton OOTB, once they fixed it, I purged and havent gone back. In the future I wont be doing that. I love Bethesda games, so in the future I'll just wait it out. I did make sure to play the heck out of it while I was on Windows though.
In hindsight, I really didn't need Windows, but I was impatient.
Yeah, I noticed this myself ~4 years ago when I was playing Overwatch on a relatively low-spec PC. Gave me 10-20% GPU headroom and ~2gb of extra RAM I never had on Windows.