What evidence do you have that SAT scores don’t correlate with freshman-year retention rates, 6-year graduation rates, and all sorts of life outcomes such as income, post-grad degrees, or book authorship, because I’ve seen pretty consistent evidence of those correlations repeated across decades?

GPA and family income correlate strongly, too, perhaps a bit more than SAT, but ‘school quality’ obscures the significance of GPA and disadvantages those from less affluent backgrounds, whereas SATs help such students demonstrate college-readiness despite poorer grades that might result from life events or other burdens.