Being committed to an Ivy is a pretty hollow thing to an extent. Admissions declined to admit several 2015 HS class commits at several of them, most notably multiple instances at Princeton and at Penn. A coach committing you means he will support the application for admission folder. And that isn't going to carry weight for a lacrosse ringer with a 3.4 or below and average scores. I suppose Harvard is all the wiser to frown upon the public flouting of a commit given that sobering reality. It is nice to have a coach support your son's application. Really nice and it makes a difference IF that kid meets or exceeds all of the standards, and the standards are high and at a few of them they are really high. We like to call it de-committing from Penn to go to an ACC school or the like, but if you believe that is what really happens later you are kidding yourselves.