In Lisp, those following programmers can simply macroexpand. With modern tools they can even do it inside their editor, co-located as replacement text in the sa

In Lisp, those following programmers can simply macroexpand. With modern tools they can even do it inside their editor, co-located as replacement text in the same source file, connected to a live Lisp environment, if they wish. A great example is Common Lisp's own LOOP macro - if someone's usage is difficult to understand, you simply ask Lisp to expand it into the more verbose non-LOOP fundamental calls, and you don't need to understand anything about LOOP. In fact you can replace the LOOP form with the expanded code. That's a key difference from DSL's in most other languages where the DSL code is really data structures that are interpreted.