I'm of two minds about this. On the one hand, I think it's a misconception to think that a nothing-but-the-proofs-and-definitions approach makes it any harder to understand math. Math is just freakin' hard. Making it fluffier only makes it seem easier if you confuse page rate with learning rate. On the other hand, knowing the motivation and context for a piece of mathematics is very pleasant, makes it easier to focus and work hard on the math itself, and occasionally can be as important as knowing the math itself. My ideal math text would contain a lot of exposition at the beginning of each chapter and then the traditional dry presentation of the mathematics itself. I wouldn't want the exposition and the mathematics mixed too finely.