when the ntfs3 driver was released I moved my games to an NTFS partition, i don't remember precisely but some wouldn't work, and then unlike my ext4 or btrfs partition which were unbreakable, a lot of things became unreadable and undeletable after a forced shutdown

Did you symlink the compatdata folder?

now I'm planning on making a btrfs partition for my games and using winbtrfs

I heard that with winbtrfs, you run into permission issues where every time you boot back into Linux, you'd need to chown any files you'd created in Windows, which would be a PITA. Also, I heard winbtrfs in Windows isn't as stable as ntfs3 in Linux. Neither solution is unfortunately perfect so you may need to try and see what works best for you.

In general though, I believe regardless of what filesystem you choose, it's recommend to NOT share everything and instead maintain a copy of the library native to each OS, and just share the "common" and maybe the "download" folder, and let Steam discover the existing files when you proceed to install the game.