Consider Nanamo Ul Namo, who likely has an assassination attempt on the table. She apparently appears in a Culinarian quest and possibly elsewhere that I'm not aware of. Does that mean she has plot armor?

If, hypothetically, a major character gets killed, would Square Enix change any other quests involving them? Or would they just play out as before? Or have two versions depending on whether the character is alive or dead in that player's personal timeline?

It's something I've been wondering for a while because I don't know how MMOs usually deal with this kind of stuff. Of course, most MMOs also have way less plot than FF14.