You pull you tank question.

[Galvuu]

Ah yes, maybe I should throw you into a different game besides Final Fantasy, put you in the tank role, and immediately I'm going to force you to tank things in the hardest method possible day 1, with no knowledge of content structure, future mechanics in instance, no knowledge of healer kits and cooldowns, no open world practice for your rotation, and see how flawlessly you run. But if you die, it's a you problem right?

I didn't even read all of the other posts, but we're clearly talking about XIV.
In XIV, your aoe rotation is 3 buttons, maybe 4/5 with the one ogcd damage button that you press once a minute. You can set up your hotbar and practice this on a dummy for 30 seconds.
Then you just also assign your mitigations and press them in a random order, one after the other.
Even if you only hit 1-1-1, you generate so much aggro with modern tanks you'll probably be fine. If you miss one of the mits or misclick it, you're fine.
There are games where it's not so simple, but for XIV, in dungeons, it really is. You don't need to be "flawless", it's not that challenging...