A timed foot race is a quite reasonable measurement of athletic capability - like, it's not a perfect one and a more thorough and diverse evaluation would be better, but if you don't have a better evaluation option then it's obvious that it has some information; if you'd take a hundred random people and split them into two halves based on foot race times, then that would be a far better separation than one based on randomness or any factors that measure athleticness even less.
I mean, it's okay to use the best imperfect metric you have available; so acknowledging "the metric is not fully correlated and depends on other factors" does not mean anything, the only argument that has weight is "hey, this other metric has better correlation with The True Thing and less bias, use that instead"; if the remaining alternative metrics are even less objective and more biased than SAT/ACT tests (which IMHO is the case), then removing SAT tests won't and can't improve things, despite these tests being flawed.
that would work if you were talking about random people who were selected to do a surprise track race, but if the track race is known to be THE measure and that can be influenced by training then you’re going to see skew.
to be clear, i still think the sat is better than everything else because preparation is much more legible and accessible compared to all of the other ways to stand out for college applications.
I mean, it's okay to use the best imperfect metric you have available; so acknowledging "the metric is not fully correlated and depends on other factors" does not mean anything, the only argument that has weight is "hey, this other metric has better correlation with The True Thing and less bias, use that instead"; if the remaining alternative metrics are even less objective and more biased than SAT/ACT tests (which IMHO is the case), then removing SAT tests won't and can't improve things, despite these tests being flawed.