You're right, it rigorously shows how well you will do on IQ tests. That's a real useful metric, now isn't it?
> This is often disputed by impulsively triggered non-experts browsing chat forums, but not by serious academics.
This is often upheld by people with latent fascist sentimentalities that there is some genetical component that makes one group superior to the other.
Surely IQ is measuring something useful if it correlates so well with things like job performance, school performance, income, and crime? https://en.wikipedia.org/wiki/Intelligence_quotient#Social_c...
It might be just correlating to zip code. We know poorer neighborhoods in the US have vastly higher rates of lead which has negative effects against IQ and violence. I've seen far more evidence against the concept of a general intelligence than for.