I see Utah's point. And, also, I don't care who they schedule OOC.
Looking at the schedules in the link, BYU shows up often for many teams. The other teams are willing to play BYU and another P5 team in the same year. So, at the very least, Utah's approach as to BYU and P5 teams is different from others.
And while I see Utah's point, I think they are wrong. Playing BYU isn't some strange detriment to Utah. It's been a guaranteed win for a decade. Beat BYU, play some mid-level P5 team and drop the other MWC-ish team. Seems easy.