For whatever reason, when I saw the name Hawking next to Many Worlds my mind went to multiverse explanations for how universes come about, forgetting the two major schools of the Copenhagen interpretation.
Speaking as a biologist who probably misunderstands more physics than I understand, it still seems like a really messy explanation. Is a new universe spawned every time a photon is absorbed? The number of parallel realites this would produce is mind boggling. Our fallible intuition shouldn’t be the basis for rejecting a theory, but MWI seems a bit too far out there, at least in my opinion.