They were most likely thinking about having each job feel like it's own thing. It's not just healers the tanks feel like 4 distinct entities as well. To be honest though every job in CC has come down to mastering a playstyle and some are easier than others to grasp.

Personally, I hate playing against SCH because they just keep coughing on people. I lost track of how many times I escaped a CC lockdown just to die to SCH cooties before my elixir could finish or I could reach a potion pick up.