> * The proliferation of Linux filesystems such as ext4, XFS, ZFS, btrfs, reiserfs, JFS, JFFS, bcachefs, etc. If any of those filesystems were truly adequate there wouldn't have to be so many.

While I get your point, I would like to point out that ZFS was developed by Sun (now Oracle). I've used ZFS for years from a data-integrity and array-mirror perspective and love it. No other file-system you mentioned next to it gives me the confidence that ZFS does (maturity, stability, etc).