Let's have some examples:
The original PHB Wizard (Can choose between a couple of dailies each day, being more flexible than others somewhat)
The Barbarian (Daily Stance Rages, trades additional rages for fixed large [W] damage)
The Monk (With his movement + attack powers)
Psionics (Replacing encounter powers with a power point system - it's not perfect by any means but it works well enough now with the odd wonky power. But then again everything has wonky powers somewhere)
None of these needed to ignore balance to get terrific unique flavor and interesting new mechanics to the game. Why since essentials has the "brains" behind the design of classes been thrown out with the baby AND the bathwater? Classes have been adding interesting new mechanics while still being balanced for several years now. Why are the current designers suddenly incapable of doing this?
And most importantly, why are PCs getting worse and monster design keeps getting better?! There is only ONE conclusion. An anti-PC Illithid has taken over Wizards and is deliberately trying to spite players and give DMs more brutal ways to dispatch them. This is the only logical explanation.