It seems keen to shrug off the oblique, convoluted lore surrounding the eon-long Assassins vs Templar power struggle, which managed to reach new peaks of ludicrousness even after that bit in the second game when you punch the Pope into unconsciousness in order to access an alien hologram.
Assassin's Creed 4: Black Flag doesn't really want to be an Assassin's Creed game, and I don't blame it.