My take on Geno's philosophy is this. Geno & staff give a fair look at many players, and are meticulous in analyzing how they will fit in. He is a loyalty minded coach who is so sure about who he recruits, that he is willing to pledge allegiance to a player to the exclusion of all others. This is not as drastic as it might sound, because there aren't many others he would accept anyway. Very few meet the criteria that must be met to become a Husky. He would rather do without than have just an ok fit.
Recruits see this loyalty as a big plus. Look at Caroline Doty as an example. After all those knee operations, he still championed her contributions and she was still a vital part of the team. Same with Heather Buck. There was no attempt to push her out. If she was ok with not getting many minutes because others happened to be better players, she was still a valued member of the team and felt included.
Sure, there were mistakes and a few decided they would achieve their personal goals elsewhere. But, in those cases, it never seemed to be a case of a player being pushed out for someone else. The fact that there are usually open slots on the roster, to me, shows he would rather be under staffed than take a player who isn't a perfect fit.
So telling someone it's you or no one makes perfect sense in the world of Geno. To him it's a lifetime decision and compromise isn't an option. He's a lucky guy. How many of us get to pick our family. And, from the players standpoint they end up feeling great about themselves. How can you beat that for a benefit of being a Husky.