[wolf550e]

Imagine that instead of developing an app in a popular programming language, someone implements an idiosyncratic domain specific language suitable for the kind of app they need to build, and then builds the app using that. The result would work and maybe even let them be very productive churning out more features of the kind that were envisioned when the DSL was developed. If they need to extend or fix the DSL, as the original author, they can. Someone else will need to learn the DSL before they can do any work on the app.