its obviously just an abstraction over an IQ test.

Id argue its probably quite hard to find a 'top talent' that has an IQ thats substantially outside their desired range. Obviously theres variance and there's other factors that contribute to someones success in their career, but their raw intelligence is certainly a large input thats worth considering.

Its nearly impossible to train someone with an IQ of 80 to be a senior software engineer.

and please dont respond to this comment claiming IQ is a useless metric. its not, and thats been very clear for decades.