The only way this is really true is the defense debuff it put on undead, which is great for bypassing damage reduction of ghosts/skeletons depending on what weapon you use.
We simply don't encounter undead enough for a focus on our undead killing spells to be effective, and cures have been nerfed too hard against undead to be effective either.
Black Mages, Scholars, and Red Mages can easily nuke harder, even on undead. I'd imagine that Dark Knights and Paladins come close.
Afflatus Misery only records the latest hit, so even that doesn't really help.
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I've been refraining from posting in here again, because I have no interest in talking to people who have the opinion "because job x is good at something they deserve no attention except nerfs" when said job only excels at support. Every job in FFXI is capable of damage dealing, and should be considering the way people treat support jobs - additionally, other jobs can't expect greater healing or support ability if the main healing and support job is incapable of doing damage. Personally, I don't think White Mage is going to get much of a boost to nuking outside of maybe another underpowered tier or two, but those aren't going to make the difference, because White Mage is a pretty terrible nuker, and the real power of White Mage when it comes to damage has been melee for a very long time.
But I suppose posters who think White Mage shouldn't be given anything but a nerf want White Mage melee to be nerfed as well?