Do they? My experience reading them doesn't indicate that at all, IQ is enormously important in determining lifetime success it's just there are different plateaus.
Once you achieve a certain IQ threshold (be it 115, 130, 145, whatever) then other factors play a bigger role but before you hit that threshold your outcomes statistically will be much worse than even the lowest performers who do make the cutoff.
Once you achieve a certain IQ threshold (be it 115, 130, 145, whatever) then other factors play a bigger role but before you hit that threshold your outcomes statistically will be much worse than even the lowest performers who do make the cutoff.