It forces you to understand how Windows functions on unexpected conditions and that knowledge can be extrapolated to other situations where something on Windows fails for no apparent reason and you just know it because you saw it before.

Do not underestimate the power of arcane knowledge.

Why keep different filesystems outside of specific performance needs? I've experimented with weirder things, like Linux running on NTFS with the new kernel driver.

Assuming subvolumes work you could dual boot and avoid having to partition your disk, which would allow you share the space on a drive freely between multiple OSes. That would be especially nice in places where drives and space are a premium, like a Steam Deck.

This is a science experiment.

Actually I have been looking for just this for several years, even as recently as a few weeks ago I was looking, but only found some commercial btrfs driver. The idea of unified storage is really nice, you don't have to decide how much each OS gets, and with btrfs you can just plop in another drive and extend onto it to transparently increase storage capacity. On top of that, tings like duplicating steam game assets would probably be a big win.

During my transition period from Windows to Linux, I stored the majority of my games on my NTFS drive because it was much bigger and I wanted them available on Windows in case they didn't work on Proton. I could play them from Linux with ntfs-3g but some of them would just refuse to launch unless I moved them a non-NTFS drive. Maybe they would've worked in this scenario? Hard to say.

Less Microsoft-centric stuff on your computer.

btrfs is pretty comfortable to manage, too.

On that point: I wonder how the subvolume experience is.

Step one: Include Linux kernel in Windows.

Step two: Include Linux filesystem in Windows.

Step three: Windows is Linux.