I don't get this article. As far as I can tell, it wants to prove (in spite of the headline) that mental illness and creativity are not really correlated. Then

I don't get this article. As far as I can tell, it wants to prove (in spite of the headline) that mental illness and creativity are not really correlated. Then it goes on to say that measuring either mental illness or creativity is hard on its own -- in which case the meta-analysis done isn't terribly useful? My own unempirical take on genius is it's not so much "you need some insanity to have groundbreaking genius-level ideas" but "some people are so into doing thing x that they will choose to do it almost all the time, and some of these people have talent and luck in thing x too, which is a potent combination that looks like what we'd call genius".