That and a lot of fans apparently don't want things very well balanced at all. 4E solved the perennial problem of the linear fighter, quadratic wizard and fans largely rejected it. I honestly think a lot of the power gamers, munchkins, and fans of god-like wizards just got loud and consistent enough that WotC caved. Though, to be fair, you could easily breakdown the assumed resources of the classes and build something for the non-casters. The martial classes would look a lot closer to Matt Colville's illrigger than they do now. Lots and lots of resources to spend. The fighter needs something like 2-3x what they have to be on par with the wizard...if you eliminate things like forcecage, limited wish, and wish.