I saw this mentioned earlier in the thread and just wanted to emphasize and expand on it.

Imagine , for tanks, your combo was basically Frontline/pvp variant (One button press continues your combo string of, say, Heavy Swing>Maim>Storm's Path/Eye). You had a singular Dot Gcd. And then, to fill the rest of your class load out, about 10 different variants of Rampart of various effects and cooldowns. That is tragically what playing healer has, and as you can imagine, isn't very engaging