Because 99% of math is basic calculations.

0.9% are 100-200 level math problems.

0.1% are beyond that, but at that point, hopefully your 200 level skills have taught you enough to learn about solving that.

In my lifetime, I only had 1, beyond 200 level problem that required research on math to understand. And technically, it was optional, but I volunteered.

Everything else was algebra.

Stats is theory + math not just math. Maybe not even any math at all, just light programming using stats libraries. If you apply them wrong though, that's a big problem. Biological experiment design is a grad course, so 500 level. Still I agree that a doctor understand the theory.