How do we always go from university rankings based on research results straight to comparing what in the US are predominantly Bachelor graduates? I think it is

How do we always go from university rankings based on research results straight to comparing what in the US are predominantly Bachelor graduates? I think it is abundantly clear that research prowess really has very little bearing on how competent you are in teaching say Linear Algebra. Which is how we got the whole MOOC thing in the first place, there is no magic Harvard Linear Algebra but there sure are tons of social mobility barriers and they don't really care for the curriculum one bit as much as having that upper strata origin Ivory league stamp of approval.