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Originally Posted by Richard_Todd  A Theory of Everything wouldn't mean that any two observers can agree on what happens in reality. Even if it would, such a theory has not been found. |
A Theory of everything (TOE) is a hypothetical theory of theoretical physics that fully explains and links together all known physical phenomena.
Therefore, it wouldn't matter whether two observers can agree upon what they thought happened in reality, because a TOE would explain what really happened in reality.
And yes such a theory has not been found, and is probably a long way off from being found.