I am not sure if Raiden's intended point is the same as what you are saying here. If it is, then you can just ignore my other comment, it was arguing with a position nobody held.

I absolutely agree. The local utility of each universe does have to be constructed with care.

I also have strong feelings that all utility functions are bounded.

I was imagining one utility function for the multiverse, but perhaps that does not make sense. (since the collection of universes might not be a set)

Perhaps the best way to model the utility function in my philosophy might be to have a separate utility function for each universe, and a simplicity exchange rate between them.