You seem to have an intuition that our classical universe has to be capable of calculating the entire reality; therefore, if it can’t calculate many worlds, then many worlds cannot possibly exist.
But… why?
How is the argument “the multiverse has to fit inside the universe, or it’s not real” fundamentally different from “the universe has to fit inside our Solar system, or it’s not real”?
You seem to have an intuition that our classical universe has to be capable of calculating the entire reality; therefore, if it can’t calculate many worlds, then many worlds cannot possibly exist.
But… why?
How is the argument “the multiverse has to fit inside the universe, or it’s not real” fundamentally different from “the universe has to fit inside our Solar system, or it’s not real”?