I'm sort of wondering when our eagerness to ride more and more dangerous monsters eventually backfires and we cause the destruction of the known planet. I mean, we have hundreds of people riding dragons, giant Zu, miniature Ozma, artificially tamed Alexandrian combat drones, Behemoths, Coaurls, hounds, bomb propelled steel benches, and apparently semi-functional magitech armor.
That and the primal aligned mounts are probably loyal to the primals that they originate from...