I know Occam's razor is not a valid scientific argument, but supposing that everything just exists removes the arbitrariness of it all, our subjective view of the world in particular. It's the simplest explanation of it all.

I also believe that the simplest axiomatization of this theory would be a paradox. From a false postulate, any true (and/or false) statements can be derived. Including that which describes/corresponds to our reality.

It only takes 0 == 1 for everything to exist, but that's something we cannot logically prove, nor use at our advantage. It's a useless theory of everything, but a neat one.