Why does Harvard University actively encourage a constructive Gap Year ?

Harvard students

https://college.harvard.edu/admissions/preparing-college/should-i-take-time


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“Twenty years from now you will be more disappointed by the things that you didn’t do
 than by the ones you did do. So throw off the bowlines. Sail away from the safe harbour.
 Catch the trade winds in your sails. Explore. Dream. Discover.”

— Mark Twain