I like that they leave it open to personal exploration. It makes your character feel more unique when you can create your own origin story. I also like that the first lore book loosely and I mean VERY loosley mentions their being other tribes for certain races like the Elezen, which means if you don't feel like you fit in with one of the 2 sects we get, you can make your own. I like to think Hax hails from a long lost Elezen clan that defected and went out into the desert or one of the islands around Thavnair. Gives a little more flavor and helps to make him a little more unique than your average High House Ishgardian Elf.