i personally think the whole problem is rooted in their belief to have a perfect balance in the game. Healer role is one of the roles that should and must be asymetrical. It felt very good in ARR precisely bcs it was asymetrical, bcs whm and sch did complemented each other very well and both had defined strenghts and weaknesses. Now healer at their core play the same with little variance. Remember when sch couldnt aoe heal for shit in ARR? who cares now you just have like 6 aoe ogcd heals, so that clear job identity and clear weakness was lost. Healer is not a role that works well when you just have multiple classes with the same actions but with a different animation. Look at sage its basically 90% of scholars kit.