"The purpose of school isn't to differentiate between who are the elite and who are the median, but whether to certify that you learned whatever it was they were supposed to be learning."
And, grading helps to determine that. The problem is that classes have become so easy that the median are gaining an "A". This means that classes aren't being pushed hard enough. Instead, they teach to the lowest common denominator, or they make the grades less about mastering the material, and more about how easily one can push through loads of homework, or how quickly one can look up the right answer when given ample time. The curve grading system sucks, if enforced in retrospect. Instead, the curve should be a tool that feeds back into the school, and tells the school whether the classes are too hard, too easy, or just right.