My article is a bit oversimplifying but not because I think intelligence and productivity are "one-dimensional quantities", but rather because you have to simplify in a blog text - texts with endless qualifications become too long and tedious to read. Also I did say that other characteristics besides intelligence also are important.

Thanks for the link; interesting and sympathetic. I'm not saying you have to be a genius to do math: I'm saying some mathematicians are vastly much more productive than others. And I don't see anything in Tao's article that actually contradicts that.