If priesthood blessings were effective then the hospitals in Utah would be outliers throughout the world of medicine

If the church was real and blessings worked you would have doctors and medical administrators from all over the world traveling to Utah to study why Utah hospitals were producing such incredible statistics. In truth, the blessings are just a sugar pill placebo nonsense that maybe makes the members briefly feel nice about themselves, but produces no measurable results.

TLDR: Priesthood blessings fail to pass the scientific method.