I feel like "the mechanical design of D&D 4e classes strongly dictated role in a way 3.x didn't" can't help but be disingenuous, because it's comparing, y'know, basically the 4e PHB against the entire fucking broken end-of-edition OGL ecosystem
An apples-to-apples PHB comparison absolutely isn't going to let you build your wild out-there off-model Strength-based wizard in 3.5 either
Which reduces that argument to "we were making excuses for hating it for just not being 3.5 at that 'see what the DM will stupidly allow us to get away with' point in its life cycle"