Hi Nick and Jack, thanks for your thoughtful inputs. I've now removed the option.
I agree we should have a discussion on whether :results value is a good default. But I think this needs previous work on documenting what is the actual behavior of the main Babel libraries wrt "value" vs "output". I will start a file on worg with a table describing the current behavior of various libraries. E.g. ob-clojure.el the output by default, not the "value". Once we have a cleear picture on how various libraries distant themselves from what could be expected by reading Org's manual, then we have more background and could start the discussion on changing the defaults - 9.5 would be a good time. Thanks again, -- Bastien