See, on the one hand, I agree with this, because it’s true that the school system in America places way, way too much importance on grades.
But on the other hand, I think students (good ones, anyway) really do value learning, but because they don’t have the power to rebel again the school system in a way that will likely affect any real change, they resort to cheating so they can get survive the school system. And then learning happens elsewhere.
The biggest problem here is that so much learning is supposed to be done in school, but since students have to focus so much on getting good grades, learning becomes a lot harder and much of it has to be done elsewhere. But when students have to spend so much time and energy on getting good grades, there isn’t a lot of time to go elsewhere and learn.