Ah, so not just every possible universe, and not just every conceivable universe, and not just every coherent idea of a universe, and not just every arbitrary state of a universe, but every collection of arbitrary notions about any form of existence no matter if those notions are compatable in any way with anything.

In that case, the vast majority of universes are not possible to understand by our laws of logic. Most of them no longer exist either, as half of them spontaneously ended in 1602 and another half fell to false vacuum decay a billion years ago, and an infinite number of other things. Yet since we're disregarding all logic and taking every arbitrary position, there are infinite universes where they spontaneously stopped existing every second since they started existing yet continue to exist, are one dimensional yet are made of nothing but triangles, have nothing but paradoxes yet are perfectly understandable by us, and are also in a multiverse where no other universes exist.

It's a useless concept, as you can posit that any point at all is true. It's also self-defeating, as our continued existence proves that there are no universes that have destroyed our universe permanently, and thus not every conceivable state can exist simultaneously.

Is there some use I am missing?