Your test is basically asking “is it similar to something popular”, there will always be a learning curve when changing to a new, different from what you’re used to, tool. In my personal experience, I’ve seen people go from no Clojure or functional programming knowledge to productive in a few weeks, that’s quicker than I’ve seen some people go from non-OO to OO (although I imagine it has more to do with the people than with the paradigms)