Why is the fact that filenames can contain newlines and executable shell commands always framed as a problem? You can have files that write to themselves and ch

Why is the fact that filenames can contain newlines and executable shell commands always framed as a problem? You can have files that write to themselves and change their names. This is a massive boon for expressive power of a language. You can have a lot of fun on the command line with a couple files and eval *. "We have persistent "meta"objects, they're called files."