They allow for a challenging fight in the open world and they will respawn, allowing you to continually fight once you've beaten one. Man, some people in these forums are so intent on the grind and end product that they forget to have fun. In 1.23, at the End of an Era, I wonder how many people looked at the wall of Goobbue mounts in front of Ul'dah and came onto the forums to complain that people were doing pointless things and that this ruined their game somehow.