Whitemage got almost nothing thats actually useful, its all circumstancial and frankly bad. Scholar took nerfs to both its DPS and its Fairy's healing potency and all it got was a contingency heal (which is underwhelming with the cleric stance change- which seems to have been what the contingency heal was designed for) and a mediocre crit buff (its not additive). Astro got powerful new toys that make up for its few shortcomings and a bunch of buffs- while still having the lowest mana costs to boot. All they need is a lustrate equivalent and a bit more potency on Malefic to be literally the best at every single thing healers do (not that burst healing or individual DPS contributions matter anyways).