I'd rather read your comments instead of throwing the word arbitrary around. All it amounts to is you handwaving a discussion you can't be bothered with. We have whole raids dedicated to how Mhachi mages were able to control high level voidsent. And only broke free several years after a flood happened and wiped out the nation. We've had Mages build the construct Ozma which still worked to this day. We've had Thaumaturges undergo summoning rituals which is the only reason Ultros is even in XIV. We are talking about a low level Chimera here. And even then in relation between job quests and abilities do they have symmetry with each other? Nope. It was more "grats you completed quest have a skill you wish you had 5 minutes ago".