Here is where I think physics is making the greatest mistake: “observation” or “observer” are overly misleading concepts that really mean “interaction”. ANY interaction.

I mean, physical existence depends completely on interaction. If something doesn't interact with the universe, then we can safely say it doesn't really exist.

We could go even further and state that physical existence IS the continuous recreation of structure by continuous interaction with other elements, and hence, that existence depends on continuous “observation”.

So there's no “unobserved” state for anything really existing in the universe. If something really exists physically, it has no other choice than to interact with the universe somehow. It MUST be observed by some other part of the universe to really exist. It may not be observed by a conscious being, but for sure it has to interact at least once to be real.

And conversely, an interaction that has not yet happened is not physically real, and should not be considered. So no superposition of possibilities could be real, not even at the quantum level. Only the factual realization of an interaction (when/if it happens) is real.