My honest ideal would be to intertwine healing and dpsing together. And I don't mean like sage... a very basic example is how lilies work. By healing, I get to do damage. Great. Now that lilies are damage neutrla, I'm encouraged to find reasons to use those heals. That's a smart design. And I'd love if the opposite was true. Give me like a 'petal' bar that increases every time I do damage and when it fills up I can cast a high damage nuke spell that makes my next lily off the global cooldown. Or give me a proc on dealing damage that makes my next single target healing spell also apply regen.
Make doing damage and healing part of the same kit and intertwined in interesting ways. Reward me for dpsing with healing... and reward me for healing with dps. THAT would be my absolute ideal. (but at the same time, I do enjoy what I'm doing now because the fight design is really good so *shrugs*)