Jordan Peterson (who I think is a brilliant thinker and public speaker) makes a very interesting point about social statistics: the real issue isn't the 60/40 split between the masses. The real issue is between the outliers: when there's a 60/40 split between two large groups of people, the spit between the extremes (the people who out-perform the group, meaning the over-performers) is far greater (95/5 to 99/1).
For instance, in NYC (or NYS, I'm citing this out of memory, so I'm not entirely sure which), an overwhelming majority of genius level IQ tested high-school students are ethnic Ashkenazi Jews. A crazy amount, something like 49 out of 50 "genius" IQ students in NY are Jewish. That's a natural consequence of Ashkenazi Jews being, on average, about ten points above the average population, in IQ. Which is not that much. But small statistical differences result in overwhelming differences when it comes to outliers (in this case, geniuses).
Another good example of this, often cited by Jordan Peterson, is the radical split in prison population, by sex...pretty sure it is above 9 to 1 in "favor" of men...despite the fact that, on average, personality traits that favor criminality, between men and women, tend to be around 60/40 percent...which, on the surface, doesn't seem that significant until you look at the results in outliers.
And, of course, outliers determine the future of a society. It's hard to argue with that. Albert Enstein (a person who can be objectively judged to have had superior intellect, without an IQ test) was more important than 5 billion people, all added together, who lived since. Clearly. If high IQ really does equal superior intellect, then no one else really matters in the NYC school system on a societal level, except Ashkenazi Jews. And no one really matters on the African continent, period. So, if you buy into IQ (like Jordan unfortunately does...but with a caveat: he does not claim any kind of omniscience, he is open to counter-arguments, and I think he would be blown away by someone challenging his definitions, I don't think he ever met someone able to do that), you can't really dispute these types of conclusions. The only possible avenue of attack against that position is attacking IQ (and social sciences in general, because Jordan is correct: IQ is one of the better parts of social sciences).
Jordan, as far as I know, only makes one decent argument for IQ: there's a strong corelleration between IQ and financial success in the West. Which is somewhat of a non-sequitur.