Grades don’t capture the difference in learning ability you use as an absurd example. Furthermore, this “observation” is sufficiently vague so as to be a truism

Grades don’t capture the difference in learning ability you use as an absurd example. Furthermore, this “observation” is sufficiently vague so as to be a truism. “Businesses don’t want to hire stupid people” is not novel or meaningful as a supporting argument to whatever your point is.