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By “wide ranging utility” you mean “detecting and diagnosing mental disabilities” right?

If not: Using IQ for anything else is, at best, quite useless, and at worst, severely problematic as you found out when you heard about scientific racism (such as the eugenics movement).

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By useful, I mean saving the US military hundreds of millions of dollars. It's not perfect, and I would argue it's not even very good, but it does work. Which among several reasons is why it's been outlawed for US companies.

you keep claiming that there is some threshold above which it does not predict anything even though this contradicts all available evidence. like taleb your beliefs are based on nothing more than unfounded speculation.

No I don’t claim that (even though Taleb might have; didn’t read him thoroughly enough). I say that there is a (muddy) threshold where these tests become useless. They still hold predictive power, but what they do predict is useless.

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