BYU left the MWC just as Boise joined in 2011. Here are some recruiting and season results since that time
Recruiting: (according to 247sports)
Boise:
2019 50
2018 57
2017 64
2016 68
2015 58
2014 63
2013 55
2012 61
2011 53
Average: 58
2008-11 ave: 88
BYU:
2019 81
2018 78
2017 66
2016 49
2015 65
2014 64
2013 66
2012 71
2011 69
Average: 67
2008-11 ave: 44
10 win seasons:
Boise 6
BYU 1
AP top 25 finishes
Boise 5
BYU 0
Boise St has outperformed a lot of teams, not just BYU. What makes it so interesting to me is that BYU used to be Boise. Big fish in a little pond. Boise has an identity. BYU gave theirs up for $$$ and "exposure".