I sometimes wonder if they could be useful for an OS shell, striking a balance between the extensibility of a text-based shell and the discoverability of GUIs.

I sometimes wonder if they could be useful for an OS shell, striking a balance between the extensibility of a text-based shell and the discoverability of GUIs. I mean, combined with search/autocompletion, they're really just a slightly more rigid and structured version of text snippets.