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Regarding your #2781. I do not defend the use of probability theory in quantum textbooks, which leaves much to be desired. But the consistent histories approach used a time symmetric formulation of probability in the very first paper I published on the subject in 1984, and that is still true, at least in the way I formulate it. Let me suggest you take a look at some of the items I have listed in the Consistent Histories topic, and if you want to dig deeper I can suggest relevant chapters in my book. Before you maintain that it cannot be done, let me suggest you take a look at a place where it has (I claim) been done. My approach may contain mistakes, in which case I would benefit from your pointing them out, but if not it is a counterexample to your assertion.
I do not deny that ‘observation’ may play a special role in your modified QM, but why is this an advantage if no similar concept is required in either classical physics or quantum physics interpreted using consistent histories?