That's fine, but we should compare apples with apples: actual-learning SAT prep with actual-learning extracurriculars, or cram-school SAT prep with cram-school extracurriculars.

I agree with you that this sort of mission of self-actualization for kids is a laudable goal. I personally hated school and spent 12-18 blowing off boring coursework to indulge my curiosity with computers. In that ideal world, I'd say it's a tossup between whether reading/math or exploratory hobbies are more important (probably depends on the person). But in the world we live in, where kids are burdened with the reality of practical concerns, especially the ones for whom college is supposed to be their ticket to social advancement — in other words, in the world where it's a given that kids are going to be doing meaningless hoop-jumping — the SAT tends to be, I think, a much more reasonable hoop to jump through than faking extracurriculars and "holistic" merit. Like 'rayiner says, a summer of studying, versus four years of starting fake clubs, doing various competitions, trips to third world countries, volunteer work, collecting awards across various hobbies, and whatever else is on the checklist now (these were the things in my day).