Originally Posted by
Shurrikhan
It is, but not all rates of application are equal, nor is the value of each point of potency.
MCH would benefit far more from MNK > VPR / NIN > SAM than DRG / RPR / DRK / PLD / WAR / GNB and not at all from any caster (exempting RDM for 3 hits per spender combo). This creates job-stacking issues the likes of original Brotherhood, but now worse so.
Meanwhile, the others wouldn't add their own potency to the Wildfire; they add X per hit of the MCH's potency, which may, due to their lower priority at MCH gear compared to melee so long as MCH produces so much less aDPS (~12 to 15% less), be a fair bit lower.
...All that being said, I'm not sure I'd agree that the best solution is a traditional raid buff. Samurai does just fine without one, and I'm not sure we need yet another buff to stack all at the same time or else risk cascading dps loss from desync. Generic raid buffs have long since lost all originality, and that degree of homogeneity in scaling certainly won't be necessary until Light Party hardcore content is more than just a side-gimmick.
MCH simply needs... a buff. Ideally of about 3% overall, with more than proportionate amount of that coming from AoE sources, while Physical Ranged (including MCH again) get a further ~3% buff atop that and RDM and SMN about an extra ~2%. And all that's more than would be necessary, even -- just... roughly the most ideal.