Comment by vbezhenar

Lisp code is made of lists. And lists are the main data type for lisp programs. So you can naturally produce and transform lisp code using lisp code. Not all lisps allow that, though, but I think that's the main differentiator and it's unique in that aspect.

So it's like generating JS code text from JS, but working with JS code as a text is much more confusing compared to working with lisp code as a list.