<p>I think what we call “randomness” would be better termed “subjectivity.” Admitted kids at high-end schools are admitted for reason. It’s just that the reason often can’t be discerned by those outside the process. When it comes down to the “coin flip” between two candidates, they probably pick the one whose essay they liked a little better, or whose ECs were closer to what they are looking for, or they just simply liked that kid better - subjective reasons.</p>