So who usually pulls then?Yes, literally. Please show me where in the game description, documentation, official literature, etc. pulling is described as a responsibility for any particular job/class/role. Oh, you can't? Meanwhile I can find an official SE/FFXIV site blurb about tank's responsibility. Hey, it's not MY fault the tanks are failing to adhere to what the devs literally (in writing, typed out, explicitly stated in textual format, all of these apply) said is expected of them. If I am playing the game as a healer or DPS, expecting other players to do their jobs as described, just as I am. When I do play as tank, I do my due diligence to keep glancing at party list and see if, based on HP bars, whether I accidentally failed to grab a mob because of a bad AoE usage, or I didn't notice an add, and either way get and keep the foes' attention from my party members. I, at least, can do what I am expected to do in my role. Sorry you can't do the same, apparently.
Go report someone for "pulling early" in a Hunt, see how far that takes you lmao. Same logic of "b-but the whole unofficial community says -" til SE makes it a rule that everyone in a zone must agree to a pull time, no, early pulls are not against the terms, rules, standards, etc. as dictated by the people who made the game. What IS against the terms? Tanks not fulfilling their basic job of "keeping the foe's attention". Not "certain foes", not "only foes they themselves pulled", any and all enemies that threaten the party.
It doesn't matter if 99.9% of the community adhered to this "standard" of "tanks are the pullers", they're not by any definition. And I'd even say that, both from this thread and my experience in game, if you're going by "community rules", W2W as a standard in content past certain thresholds in expac and/or level (the only debate really being where the line is actually drawn)is a far more prevalent "rule" than "only tanks can pull".