I am only have a passing acquaintance with them I'm afraid, though I have been meaning to get my head around it and write a few hashlangs.

https://docs.racket-lang.org/guide/pattern-macros.html#(part...

I like the explanation there, and I think it gets me closer to my objection. I'm quite happy with the Kleene Star as a concept, but I don't think it corresponds to any usual use of ellipsis, nor is it really a list element on equal footing with the others.