It also helps to avoid populist teachers that give everyone a A+++ to avoid students complains, and also idiots that give everyone a C because only God is A and

It also helps to avoid populist teachers that give everyone a A+++ to avoid students complains, and also idiots that give everyone a C because only God is A and only the teacher is B. (We don't use that method here, we use other method to try to avoid both problems.)