Originally Posted by
Vyrerus
Debatable. We didn't have to make them to get equivalently powerful weapons, and the entire process is experimental, worked on in tandem by multiple individuals. Generally Gerolt and Thavnairian Alchemists.
There's even a quest after you finish an ARR relic to make the ultimate tea kettle by going through the process one more time, albeit with truncated steps. Granted I don't think that one involved atma, but I can't quite remember how far Gerolt took the process before asking for 50 Alexandrites. Then Jalzahn asks for the same materials needed from Ifrit, Titan, and Garuda, meaning this tea kettle required that the beastmen summon their primals again... Which generally entails people getting hurt and more beastmen getting tempered.
(then there's the meta fact that since XIV is a game for entertainment, we literally did make them for entertainment, and they even feature as entertainment in FF content creator achievement hunter video type stuff... Souls used for making weapons. TEN POINTS - but we'll ignore this fact because it dilutes the conversation)