I upgraded my win10 steam pc to bazzite and the Linux driver for my old R9 380 graphics card actually supports a newer vulkan version than the win10 one, games are running great so far. I don't do insane gaming obviously but I think for older games it's a no brainer upgrade

VR is possible but not ideal right now, largely depends on your headset and the games. SteamVR is lacking proper asynchronous reprojection so you can't dip below your headset's framerate without stutter and alternatives like Monado aren't as plug-and-play. Hopefully when Valve releases their (presumably) standalone Linux VR headset deckard there will be another boost to improving VR on Linux for everyone.

Dualboot might be good since then you can tune windows to be a dedicated gaming OS which auto launches the needed things. I went from win10 to mint and haven't booted back into windows for months.

Cant speak to VR cos I switched to a Quest when I realised all I did was play BeatSaber, and the room with my computer is not very big.

As a quest 2 owner using Manjaro I can tell you the following: It works great. But sometimes things can ba a bit finicky.

Some games don't offer VR on their linux version (e.g. Warthunder) and are a pain to get working with their windows version on proton (allthough i havent tried this in a year).

But other than the odd exception everything is great!

And I think it'll only improve as Valve continues developing the steam deck and therefore improving proton.

Rufus has a flag for this too

Same. Been running it for nearly a year now

Since I would want someone to mention to me, if I was being jerked around by Microsoft while just wanting to enjoy my Steam library:

You'll be surprised how much of your Steam library runs (with minimal effort) on Bazzite Linux and it's probably less hassle to install than doing a Windows downgrade.