from my experience im very sceptical each time when someone says that business people will write these rules. on paper it looks nice but at the end if rule is a bit more complicated developers end up writing or updating the rule while someone standing behind their back :)
I’ve seen business people write rules in excel. A. lightweight dsl with a quick feedback loop (provided by a REPL in Clojure, and the UI of excel) seems to be key features to avoid ending up in the scenario you describe
