This question Is the unobserved universe quantum mechanical? was closed as off-topic with the rationale in the comments that it is more about physics than philosophy. There were comments in the thread disputing this rationale, including the OP mentioning that when the question was posted on Physics SE the response was that it is more about philosophy than physics. As a corroboration I can cite David Wallace among others, a well known philosopher of physics, whose works in particular address issues in the question. See e.g. his Worlds in the Everett Interpretation published in Studies in the History and Philosophy of Modern Physics or review of his book Emergent Multiverse in Philosophical Reviews. The closers did not comment further, so it is hard to tell the reasons. Several answers in the thread (including mine) were downvoted and the OP asked for reasons, I speculated about it in a comment, but it is only a speculation and obviously I am biased.
This is a request to users who may have more insight into the issue to share their thoughts. To be clear, this is not about closing or voting, which I think work quite well overall, just a request for feedback on this particular case. And beyond this case I think it would be helpful in better framing questions and answers concerning philosophy of physics in the future.