People who ignore their threat guage

[Jpec07]

It's 210.

But at that point, the 14k hp Black Mage is nearly as durable as the 13k tank. In other words, it's basically a non-factor.

Not really, no. In fact, this is so wrong that I'm not sure how you can say it with a straight face.

14k on a BLM doesn't go anywhere near as far as 13k on a tank, because in addition to the passive mitigation that tank has from the Def, M.Def, and Parry on their gear, the tank also has their tank stance (read: 20% extra mitigation), as well as a wide bevy of abilities they can use to reduce the damage they're taking. A BLM with 14k HP will be hit about twice as hard as a tank with 13k who uses their cooldowns appropriately - and the BLM also has zero capacity to deal with tankbusters. If that overzealous BLM pulls the boss off the tank, they generally will go splat.