Mitigation doesn't always have to come via shields. Both AST and WHM can be given abilities that weaken the boss to reduce their outgoing damage for lethal AoE, and also increase the physical/magical defense of the raid for the coming attack. This in turn allows these mitigation tools to be stacked on top of SCH shields, or each other in the case of AST/WHM. I would imagine mitigation coming from two sources would be heavily favored for EX, Savage and Ultimate.
All jobs themselves can also be given tools to mitigate their own damage as a third source to reduce damage even further, and many already do to my knowledge. I feel that mitigation should definitely be a team effort, and the devs should come up with more way than just shields to achieve it.



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