I don't see that as part of the problem. I play tank main, heals is my second and I often run normal content as heals for faster queues. While yes, the DPS rotation is very lackluster, I acknowledge that is likely due to the button bloat and having to be playable on controllers.
Again, the problem isn't the damage output, its that heals heal too much in general. You cast one and then you're back to DPS. Imagine if they nerfed healing enough to where you're casting 2-3, then you dps for a second or two, then back to healing, which I think most people would enjoy more.