A Theory about Opposition to Standardized Tests
The official reason for devising alternatives to standardized tests is that the tests don't measure creativity or common sense. (Can creativity be measured by admissions officers of universities? Are attempts at common sense desirable in universities?) The official unofficial reason is that there is a gap between the measured achievement of different racial groups. (Can we get rid of the effects of slavery by failing to measure those effects?) I suspect there is another reason: Standardized tests interfere with the ability to turn universities into conservative-free zones.
A few decades ago, back when leftists really were the arrogant intellectuals they've been pretending to be ever since, they pushed through meritocratic reforms at the top universities. They were expecting that Ivy-League students would be as politically-uniform as Ivy-League faculties have become. It didn't quite work that way. There were enough right-wing students admitted that the leftists started asking themselves “How did the enemy get in here?”
They've been looking for a solution to the problem ever since.