Maybe the Quincies are needed in the next arc [Spoiler]

The ability to completely erase any trace of a soul is inherent to the quincies; and perhaps the Soul Society and Quincies fucked up by having a war with one another, leading to the almost extermination of Quincies.

Once sent to hell (because of an extreme possession of spiritual energy after death), the only true death is erasure from the verse, which only a Quincy can do to such beings from existence altogether, otherwise I see beings from hell continuing to be a threat so long as the world remains in control of the soul king in its current order and cycle.

Maybe not? What do you guys think? 🤔