[BLM Suggestion] Raise spell using Foul stack.

[Lambdafish]

Not all Role actions need to be used by everyone class of that role.
True North on Samurai for example.
So yeah, Mana Shift doesn't have to be used by BLM.

That was my point. BLM doesn't have room in its rotation for spending mana or GCDs for anything except damage. However, people saw mana shift when it first came out and thought "omg, BLM infinite mana battery" much in the same way that people are saying "BLM needs a raise", but when you look at either statement with any kind of thought neither statements work in practice.

Giving Black Mages a Magic Vuln reduces their DPS, because Black Mages will be balanced around having it, thus giving them a net gain of 0

More DPS isn't really the point of giving BLM a magic vuln, party meta is. It would mean that BLM is more attractive in parties with other casters, and even PLD.