When what is being tested is the underlying mental model, it is probably not worth polishing, because the thing might not make sense; knowing when craft and polish are needed is important.

sometimes knowing when it needs that craft and polish or knowing when just the shape of it is actually what you're trying to test is really important. And so you might launch something or test something that looks terrible, but what you're actually testing is the underlying mental model of the shape of product. And I don't think it's worth polishing that thing actually because it might not even make sense.