I am not talking about correlations.
I am talking about people with higher IQ can solve X problem that people with lower IQs can't.
Not the ability to spot back & white patterns on a screen.
The riches people are not the highest IQ people
The Noble Prize Winners are not the highest IQ people
The best sports players are not the highest IQ people
The best mathematicians are not the highest IQ people
The best musicians are not the highest IQ people.
None of the these have excellence that can be deterministically determined by IQ. So what exactly is it good for?