Altough the machines were important to the plot (And I would have liked them to have been explained fully) Maybe Square forgot to show them?

It happens saddly... Even Sqaure arn't perfect, Anyone remember Ultros in FF6? There was a line that inplied that he had made a "deal" of some kind with Sieg/Zieg* but Square obviously forgot to continue that storyline.





*Can't rememeber if it's the real one or the imposter.