This sounds like a really innovative idea. I haven't seen a dedicated place for "collection of useful procs", but one emerging pattern is to use `app/services`

This sounds like a really innovative idea. I haven't seen a dedicated place for "collection of useful procs", but one emerging pattern is to use `app/services` and then have a bunch of single-responsibility service classes that each have call or perform method and then you use the service when you need some shared functionality. It's like a proc, but instead it's a class with `#call` method.