because they want people to get a life outside of writing supplementary essays for the entire first half of their senior year!
Trust me, you guys, you will like Dart's decision. And as spunaugle said, they have the peer rec to help out if they want to see more about your personality. Also, Selectum, most supplementary essays are usually like "Why this college" essays anyways, which I don't think help to reveal the writer's personality
that much. If you like personality-weighed essays, try the Stanford app -- you'll have not just one or two but THREE supplementary essays to worry over!