From the OP:
What are your best arguments against the reality/validity/usefulness of IQ?
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appeals that would limit testing or research even if IQ's validity is established are not [welcome].
Emphasis mine.
We all know the standard "that's racist" argument already, newerspeak is clearly asking for a factual reason why measures of general intelligence are not real / invalid / not useful. Not to mention that the post did not make any claims about, or even mention, heredity of intelligence or race / gender differences in intelligence.
Let's make distinction between "I have a prejudice against" and "I know something about you"
Assuming I know that IQ is valid and true objective measure, I can use it to judge your cognitive skills, and your opinion about the result does not matter to anyone, just as much as your own opinion about BMI.
Assuming that I am not sure if IQ is valid, then I would rather refrain from reaching any conclusions or acting as if it actually mattered (because I am afraid of consequences), thus making it useless for me in my practical day to day life.
Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!