That's a fair point but I feel like cata also greatly changed things: you couldn't do hybrid builds anymore, it was the first time the game really had specializations, you couldn't put 10 points into fire and 20 into frost anymore for example; 10 man raiding become 'equal' to 25 man; also the class design became incredibly homogenized starting in Cata and they doubled down on the accessibility idea with LFR. To me Cata felt vastly different from Wrath (and I didn't like it back in the day so I quit after loving Wrath).