I think a big missing piece with writing what you want in Rust and recompiling the editor to activate your changes is that you're not able to work with it _live_. That is, I can use the vim (or nvim or emacs) GUI/text processing/IO/etc facilities interactively as I'm writing my snippets to see if everything works the way I expected. I can send lines/expressions to the lua/elisp compiler running in the editor that I'm _currently using to write the program_ to change how it works, _on the fly_. It's an integrated programming experience in a way that very few things are--- it's not just about programmability, but this circular thing that goes on with editors that really fully commit to it.