For Caltech, something like the SAT may be more like a way to screen out some unsuitable applicants (if you can only get 600 on SAT math, you are not going to survive Caltech math) and cause some unsuitable applicants to think twice before applying and wasting everyone’s time. But that still leaves applicants with 800 math and high-700s-to-800 EBRW scores to use other means of distinguishing between.