they don't care at all about that.

But you are right that the focus of BYU is providing an excellent undergrad education.

I don't know if it has changed, but several years ago I was told that BYU caps grad student enrollment to no more than 10% of the total student population. That necessarily limits the total amount of research dollars BYU can spend (as well as the number of papers published, PhDs granted, patents filed, etc.) Unless something changes in the underlying philosophy, BYU is never going to rank highly in the metrics that are commonly used for research schools. Which makes the amount of excellent research produced there all the more impressed. (But results alone won't get you a Tier 1 ranking.)