I'd like class complexity focused on the more support side. SCH has a host of oGCDs along with the fairy and Aetherflow to manage. SCH works healing with precision and control, whereas WHM healing is more about raw healing potency. I find it legitimately fun, the problem is it only surfaces when parties are doing poorly or on big pulls in dungeons. AST has the card minigame which does need some polishing, but on its own can offer the complexity that sets it apart from other healers.