This is an excellent idea that not even I thought of! I actually was thinking of something similar to some of the ideas here when I started playing FF XI again recently (after my laptop for FF XIV died). I thought to myself, what if you could play as a class, similar to beastmaster in XI, that could charm or cooperate with the beast tribes and have them fight alongside you for a limited time. They'd follow you around, fight in battle and cast spells to benefit you and thwart your foes.

Conquest mode in FF XI was a sweet, competitive concept too! I'd like to see something like that return as well. But yeah, they should add lower level beast tribes and spread them out more so not just high-level 50 players, like myself, can only interact with them. And those faction leves don't count! >:0