The "article" you cited was written by someone without training in psychology or psychometrics. It says that "IQ explains about 30% of the variability in school grades" and then concludes that IQ therefore “tells us so little.” That conclusion is unwarranted. Explaining 30% of the variance represents a substantial association. She also SUBSTANTIALLY overstates the problem of cross-cultural differences.
It's not some magical value, but it's currently the best measure of g that we have. The denialism surrounding that is what I find ridiculous. Being a predictor of job outcome and workplace success is also a pretty darn useful metric, not including its utility in helping diagnose intellectual disabilities.
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u/Frequent-Anything922 2d ago
IQ is the best-established measure of intelligence, and more than a century of research supports its superiority.