Food for thought:
For the multiverse concept to work, there are two things that would have to remain identical in all possible worlds:
Why? Because the whole concept of multiverse can ONLY work in a multiverse setup that has identical logic and number theory.
So by deciding that “yes, logic and number theory are identical in every possible Universe”, you have made logic and number theory your deities.
Yet ,what if logic and number theory were human constructs that happen to have practical value and good correspondence with much of the physical world while also fueling imaginary Universes?
After all, if you’re willing to do so with other root concepts such as gods or language, should you not also be willing to put your own root systems to the test?
You’d have to test them with tools OUTSIDE of the systems of logic and number theory though, because so long as you stay WITHIN the same system, of course it will be able to show itself to be at the root because it is the root of the system you’re using to check the root.
To me, this is no different than using Ecclesiastical documents to prove the validity of theological constructs, which those in favor of a logic/number-theory rooted universe (or multiverse) tend to poo-poo as mythological.
My point is: Is it possible that we are mistaking pragmatic value with “ultimate truth” value?