I like my raid bosses to have some sort of story behind them. The big events of XI had hardly any lore attached - there were 6 "bosses" on the ground (Behemoth/King Behemoth, Fafnir/Nidhogg, and Adamantoise/Aspidochelone), 5 "bosses" in the sky (Genbu, Byakko, Seiryu, Suzaku, and Kirin), and 8 "bosses" in the trans-dimensional capital of the Zilart (Jailers of Love/Fortitude/Justice/Temperance/Hope/Faith/Prudence and Absolute Virtue) which had literally 0 story attached to them. And that's just from the base game and the first two expansions (so roughly where XIV is so far, I suppose). As far as I know there wasn't really any story/NPC dialogue that even hints to the existence of these monsters...yet there they are, and they drop good stuff. Fafnir and Nidhogg at least had drops that related to Norse mythology. Why were the "Gods" sealed up in Tu'Lia (aka "sky"), what were the Jailers, and what was Absolute Virtue? Why were they in the ancient capital of Al'Taieu? Who knows? At least Dynamis/Salvage/Einherjar/Limbus/etc had some sort of story attached.