Sorry, it seems that you are jumping into conclusions that were never warranted. Chesterton's fence is a principle that I learned a while ago and I am not defending that we need to throw everything away.
What I am saying is that what you regard as a "90% solution at best" is actually not a solution at all. Standardized tests are terrible predictors of performance on actual jobs. If standardized tests (or IQ tests or anything that is supposed to be a proxy for measuring performance) shows time and again that it only manages to measure people that are good to "study for the test", then why do we keep trying to use them to measure performance? Is it because it "the only thing we have"? This seems like saying "I am lost in Rome but all I have is a map of Paris, let me use that anyway."
And no, I am not proposing some other solution to replace it.
What I am saying is that what you regard as a "90% solution at best" is actually not a solution at all. Standardized tests are terrible predictors of performance on actual jobs. If standardized tests (or IQ tests or anything that is supposed to be a proxy for measuring performance) shows time and again that it only manages to measure people that are good to "study for the test", then why do we keep trying to use them to measure performance? Is it because it "the only thing we have"? This seems like saying "I am lost in Rome but all I have is a map of Paris, let me use that anyway."
And no, I am not proposing some other solution to replace it.