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Notes -
My basic claim that IQ is not and should not be a primary characteristic that we're selecting for. It's secondary, in that it can affect the acquisition of primary characteristics, particularly specialized knowledge. But it seems to me you are reducing my hypothetical PT to this one number, and that you are wrong to do so.
In fact, I chose this example because I know a PT who is not a high IQ individual. He struggled a lot during school and barely squeaked by with a degree. I wouldn't estimate his IQ higher than 105. However, he's consistently rated as an excellent PT, with great reviews from his patients. How can this be? The answer is obvious - he put in a lot of work to acquire the necessary knowledge, and continues to work hard to research the unique problems his patients have, so he has the same functional knowledge as a higher-IQ PT. But he excels in other traits that correspond with high performance in this job, things like personability, conscientiousness, work ethic, and caring about his patients as people. I do not think a higher-IQ PT would be better at the job, even in negligible ways (you're right that 99% is a made-up number, well done spotting that). PTs aren't like Doctor House, coming up with genius insights that nobody else can see. They follow standard therapeutic guidelines. This is the case for most jobs.
As I said in both my comments, obviously IQ has an impact on many things, and 'all else equal' a higher IQ PT has an advantage - but all else isn't equal, and that advantage is not as significant as you seem to think. Overall, I believe that selecting for IQ is a mistake, for a lot of reasons - in this comment chain the reason I'm hitting on is that other traits are more important to many or even most jobs, and that we should assess people based on their performance. Hopefully that clarifies things for you.
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