bullshit, with shit like symbiosis the classes were at their most distinct.
unless you consider specs being viable at their roles as mistaken for class homogenization intently because of a lack of actual player-skill being compensated for by shit imbalanced classes design from classic and even BC, because no matter how thick your nostalgia that is how it was.
the fact is the devs for wow have always been it's weakest point, many of the ideas lolgion fans hype up were based on xelnath's plans for warlock's green fire quest which was since cata's world rework the first class quest added to the game.
ghostcrawler even changed from the original stupid "assigned spec" mentality for wrath, until chilton came back and reinstated the old model of dumbed-down proc-based combat that has slowly killed the game.
as much as i loved MoP there are still cataclysm changed i wish weren't in it, like the removal of art of war as a crit-reliant reset for exor which if that was still in the game in MoP paladin's wouldn't of had such an aversion to crit until they got enough haste to operate.
hell i wish destro still had the BC version of nether-ward and was built more anti-caster.