Think in terms of enterprise apps. Jira, say. But with enterprise stuff, you can't totally insist that the company do it your way. Too many companies have custom steps at points in their workflow. So you need the ability to do some custom process at some points in your enterprise app.

So you needed more than just a configuration file. You needed a configuration file that could contain code. That's what brings you to Lisp - the ability for a data file to contain code that could be imported and executed by a running program.