I think, just as no system is fully self descriptive (there is always an axiom), and there is no fully self contained perpetual motion machine So it is reasonable to take the universe as not fully self descriptive or defining For instance can the universe create it's own arbitrary laws of physics and run molecules on that basis? No it doesn't And so essentially, a simulation, or God becomes required. And the one runn…
If a system cannot be self prescriptive/be without axioms/ (whatever you think the issue is) then adding another layer of systems is not going to solve your issue. If it can be, adding another layer is not necessary.