It’s impossible to make a serious argument while citing IQ as a useful measurement of someone’s cognitive potential.
I also don’t need to prove anything. If you are claiming this phenomenon is real the onus is on you to prove it. I can link a dozen articles about the flawed argument people channel from Idiocracy but you should search it if it interests you.
If we can't agree that IQ is a useful predictor ("measurement") of cognitive performance and potential, perhaps the most supported and studied theory in all of psychology, then I'm afraid we have no common point of discussion.
I also don’t need to prove anything. If you are claiming this phenomenon is real the onus is on you to prove it. I can link a dozen articles about the flawed argument people channel from Idiocracy but you should search it if it interests you.