"IQ doesn't perfectly predict outcomes" is not a great critique of IQ. No one is arguing that IQ presents an infallible linear ranking of human worth / value /

"IQ doesn't perfectly predict outcomes" is not a great critique of IQ. No one is arguing that IQ presents an infallible linear ranking of human worth / value / accomplishment. On the other hand, it's extremely unlikely that someone with an IQ of 85 or less will be able to understand complex abstract concepts. That's about 50 million people in the USA.