I do write a lot of Python and Bash scripts, even in my Rust projects. They're perfect for gluing together a build. But I'd add that as soon as I want an extern

I do write a lot of Python and Bash scripts, even in my Rust projects. They're perfect for gluing together a build. But I'd add that as soon as I want an external dependency (often a more featureful command line flag parsing library), I usually RIIR.