This sounds amazing because it shifts blame for poor performance from lack of simplistic analogy to easier examples to a lack of preparation, but I don't think

This sounds amazing because it shifts blame for poor performance from lack of simplistic analogy to easier examples to a lack of preparation, but I don't think what you're saying is true. Some people are born with a higher ability for some things, I genuinely doubt that people in math majors not as quick on the uptake can just be brushed aside because they didn't "prepare" as well as they should have.