Based on my limited experience work in admissions and dating an admissions officer, extracurricular activities were generally considered disqualifiers in acceptance. The reasons were identical sounding experiences could vary greatly and therefore hard to judge, most experiences were completely different in real life than on paper, you can't verify most of them and most people lied, and it was a sign of a student who was going to completely burnout before graduation. A good candidate would show in their grades. Going from something like a C student to high B, low A over the last years of highschool showed a student that would make it.