I got this idea reading a few other threads about Primals and how they had personalities in 1.0 and now the Primals being summoned in 2.0 seem to be more blank slates who just show up and wreck stuff. So this is basically just a theory, and my first attempt at lorecraft so please bear with me.
What if the Primals being summoned now in 2.0+ are not the actual Primals but simply a rudimentary imitation of their actual selves. We're told that the Primals are manifested through a cache of crystals and the will of the believers that summon it, and if I remember correctly, it was the Ascians who taught the beastmen how to summon them in this way. The summoning ritual can basically be used for anything, as we saw with King Moggle Mog. If King Mog wasn't a Primal, but was summoned in exactly the same way as the Primals (manifestation of will focused by crystals) could it not be that the Beastmen Primals that are being summoned are also not the true Primals but simply manifestations of the will of the followers who summoned them?
If this is true, then that means that we have not actually met Ifrit, Garuda, Titan, and Leviathan, but rather the fake versions of them willed into existence by the Beastmen. I think this would lend credence to the Ascians plan to drain the aether of the world to bring about a dark age. So then what are the true Primals? Will we ever meet them? Is this why Summoners can only create Egis? Because they are summoning a copy of a copy? Will Summoner later be able to summon a real Primal after we meet their true versions?