I have created a handful of DSLs over the years and I think most of them were bad ideas. Ironically the most complex one is the one that I think was actually right. It had support for a lot of stuff like loops, functions, custom variables and even some weird shit like async execution of child commands.

I think what made it work in that case was mostly that the purpose of the DSL was completely different from the others. The system wasn't designed with a DSL in mind. The DSL was just a simpler way to provide input for something that was already there.