User blog comment:Xilinoc/Ch. 598 - The Shooting Star Project (We Only Have To Beat You Mix)/@comment-25254762-20140926220510

On the note of Vollständig vs. Letzt Stil. The utility of Vollständig is obviously the lack of depowering the user once it's done. That being said, when Quilge said it's the "perfected" version, we've seen numerous instances in anime where the term "perfected" is essentially them saying "it's mass producible". In that sense, Vollständig is most definitely superior. As to the what you said about them dying to keep Yhwach alive, I don't know if it's stated that they all know about that. If they don't then all they know is that once they've used Letzt Stil, they're worthless to him. Seeing what happens to Luders and the other Arrancar dude, that's essentially a death sentence by itself. Even if they do all know that, most of them aren't too keen on the whole dying thing. Just look at Bambietta pre-zombification. She wanted to live. Personal feeling aside, given that Letzt Stil takes all their quincy powers away, that could very well mean that it takes the portion of Yhwach's soul with it. No soul, no return.

Thus, I wouldn't be surprised if Yhwach had either A) banned the use of Letzt Stil or B) made it out to be a lot weaker than it actually is to prevent its use. As well, if your whole army is basically spamming a one-and-done technique, pretty soon you're going to be without an army at all. No matter how strong Yhwach is, I doubt he could solo all of Soul Society by himself.

P.S. I love how Bazz-B keeps tanking attacks like a champ even without Vollständig.