People use Emacs for anything and everything, so by extension they write elisp for all kinds of things too. Any why not tbh? It's a general purpose language tha

People use Emacs for anything and everything, so by extension they write elisp for all kinds of things too. Any why not tbh? It's a general purpose language that's arguably no worse than python or ruby (subjectively more fun for me instead). Yes in specific cases like data science or web backend/frontend you should prefer something else, but everyday text processing, scripting is elisp's forte, so given that it's like a cross platform VM that's always there it makes a lot of sense to use it as general purpose tech to marry logic with ergonomic frontend inside Emacs.