Comment by pandoro

I'd go further and say this isn't just a hypothesis, it's the actual nature of reality. Any subjective experience is always mine and now for all observers, for all times. No subject has ever experienced or will experience reality any other way. The screen is the same no matter what movie is playing on it.

Arnold Zuboff makes a case for this in "One Self: The Logic of Experience" (Inquiry, 1990) [0]. He calls it universalism: there has only ever been one subject of experience.

One of his thought experiments: imagine a meteorite is about to wipe out all life around you right now, instantly. If this exact experience - being you, here, thinking this - is instantiated anywhere else in the universe, it will continue there without any gaps.

Hindu mystics were already exploring and articulating these non-dual concepts in great detail thousands of years ago, in the Upanishads. As Robert Jastrow would say:

"For the scientist who has lived by his faith in the power of reason, the story ends like a bad dream. He has scaled the mountains of ignorance, he is about to conquer the highest peak; as he pulls himself over the final rock, he is greeted by a band of theologians who have been sitting there for centuries."

[0] https://gwern.net/doc/philosophy/mind/1990-zuboff.pdf