You should find that vice versa also errors. After all, in principle I guess it's possible to store data in a directory (it looks like EXT2 in particular would

You should find that vice versa also errors. After all, in principle I guess it's possible to store data in a directory (it looks like EXT2 in particular would let you store data in between entries, https://tldp.org/LDP/tlk/fs/filesystem.html#ext2fs-dir-figure https://tldp.org/LDP/tlk/fs/filesystem.html#ext2fs-dir-figur... ), but the natural law is that a directory can't contain file contents.