I wanna interject here for a sec. The devs never said they were going to have more healing to do, only that they wanted to shift to more healing. What "shifting to more healing" could mean is left up to interpretation. The actual source of the "there's more healing to do" came from the Shadowbringers Media Tour where, if I recall correctly, none of the people that were invited actually mained Healer so perspectives were skewed.