Graduation rate, mid-career earnings, graduate school attendance and so forth. Those will all be higher from a Stanford, BYU, Cornell, Yale and other top schools. The same opportunities are there at UVU, so what's the difference? It's not the school itself, but its the kids who were pushed to perform their best from a young age who were admitted to those top-tier schools and went on to continue to do ambitious things. I'd guess that a lot of the high-performers coming out of UVU, SUU, and Dixie were also students who were pushed to get the best opportunities they could from when they were in high school or younger.
There's plenty of room for high school kids to enjoy being a kid and be thinking about and preparing for the future.