weaknesses for BYU basketball has been both quality depth, and players staying around long enough to develop, would care that someone who could fit both of those, left BYU.
The fact that you don't seem to get the "why" of fans caring, says a lot about the current state of you following things. 🙂
You probably looked at his stats and said who cares, glad you're gone. When anyone who follows what has been dragging BYU down would know that someone like him leaving is a huge problem for multiple reasons.