IQ is a pain in the ass.
Because the dregs of society all have low IQ
And the inventors / innovators all have high IQ.
So, we have a problem on one end, and a boon? on the other.
The real gotcha seems to be that their are points along the IQ line that REALLY make a difference. Below a certain point, the person becomes incapable of taking care of themselves are doing anything useful.
Above a certain line the person starts thinking so different as to be another species. Where there is huge difficulty speaking from one side to the other.
And these two point really need to be studied, because the middle, the average person really doesn't understand.