If u go in the lore section you can see under the naming convention that there's 86ish (that's a guesstimate) known tribes and not all of them are present in the location we have access to. I like the idea of doing more quests with the Xaela as it's my favorite area (used my Fantasia as soon as I got here because I loved it so much) but the only thing I wouldn't do is the yearly fight (forgot the name) as that would conflict with the msq.