I wonder if the xattr issue has anything to do with there being adequate abstraction of underlying file systems by the VFS? Btrfs, ext4, and XFS all support xat

I wonder if the xattr issue has anything to do with there being adequate abstraction of underlying file systems by the VFS? Btrfs, ext4, and XFS all support xattr, but I don't know if they all support xattr the same way via a single interface? And then how does that compare on macOS where there's JHFS+/HFSX and APFS?