A philosophy professor friend of mine rejected the use of Occam razor to justify the many-world interpretation. He pointed out to me that classically Occam razor aims at simplifying the object, not the theory behind the object.
The way he sees it, the many-world interpretation achieves a simple theory at the expense of a very large object, and therefore, cannot be justified by the classical Occam razor. This point is one of the favorite criticism of the anti-many-worlder advocates. Thus Occam razor can only be used if we are very clear about its meaning: the simplest theory is selected rather than the simplest object. The history of science, and in particular Astronomy has been an expansion of our horizons. The perceived world has been getting larger and larger and more and more complex as science progresses. Let's be clear when we talk about Occam. George
