I don't think this will matter for DF raids.
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Probably that most content will need decent mitigation but "pure" healers would still get SOME form of mitigation? Like WHM wings and Benison, and probably keep the shields from Neutral Sect and Celestial... Opposition? Likely only Ultimate will absolutely need 1 pure and 1 shield healer. Savage MAY need 1 of each for world firsts, but we don't know if other jobs will get reworked and how.
It's that content where one of your healers can be asleep at the wheel and you can still solo carry the entire party :P. Stuff where Red Mage or Paladin sometimes can act as the replacement lol.
Content that's balanced where you need like 1/4 participation, unlike content that needs 3/4 to 1/1.
White Mage is not OP. It's in a solid position that doesn't need much changes as a pure healer going forward. As long as they don't mess up confession again and keep it's selfish DPS in-line versus the party-wide buff healers, it won't suffer ever again.
Astro is going to get the guts pulled out of the sects, most powerful healer currently in the game because of neutral sect. Cards they might adjust percentages a bit with the whole new damage formula and this could allow them to completely rehaul this job and knock it down from OP status. It has the most to lose here.
Scholar they have some options with, because they still need to make it a desirable barrier healer with Sage available. Being a pet job I really hope we get a little more utility back on Eos
Does Chain Stratagem stay in the status quo? Is Sage is the "selfish" barrier healer like WHM is for pure? Or does YoshiP pull a Dancer again when they ripped out all the party-wide buffs from the other aiming jobs and gave it to the new job. Dancer has the lowest personal red DPS but the buffs make up for it over time.
AST, to keep the tradition of playing like something else entirely every other patch.