Most useful dps

[Marcusow86]

Is Black Mage actually good for any of the Extreme Primals? I don't think I've met a single BLM that impressed me in any of the zillion EX runs I've done.

You just haven't met with a potent BLM. Those that can pull 300+ DPS for Twintania fight.

SMN can leave dots at nails, but careless attacks can make the stacks go high due to later nails are destroyed too fast, so I guess BLM and BRD are easier and safer to play there.

Just my viewpoint as BLM, though. You can say I'm biased

Totally agree on this. SMN can be dangerous in Ifrit nail phase. What i usually do is to dot up nails counter clockwise and make sure to only dot those that have full health. When my target overlaps with those that my team members are hitting, i proceed to join them and dps normally. This is to ensure nail stack doesn't go high suddenly.