A matter of tastes.
I found it a smart choice. Last two times that The Sephriot (Yes, counting Sephiroth) was involved by FFXIV, we were starting to get into Industrial Rock. There's also the point of Industrial rock and the themes it often takes, which fit very, very well with the Fiend thematically.
I've got no problem with Industrial, having liked a few songs from the typical bands (NIN, KMFDM, PWM5K, Ramnstein) during their popular stint in the west. So having it pop with the theme of Sephriot, was actually kinda cool in my book.
I wonder if that's what they're doing with all 3. Starting out with the starting theme of FFXIV and then branching into a more unique song. Wonder what the other two of the Warrior Triad will invoke.