We don’t know yet that Munch won’t end up being supernatural, but I do agree with you that it hasn’t become a factor with two episodes left, and for that, so far, I’m glad.
Speaking of supernatural in TV or movies, the Crown: I’m on episode 6/4, after the crash in the Paris tunnel, and while both the Prince Charles and Queen Elizabeth and Mohamed Al-Fayed were alone ruminating about the recently-deceased, each had what looked like beyond-the-grave visits from the ghosts of Diana and Dodi, respectively. I never did like this trope in the first place because I think it’s lazy writing, although depending on the tone of the show or movie, I’ll allow some hallucination if it’s one-and-done, and if it’s clear by whatever the “dialogue” is that it’s being fabricated in their heads. Not my favorite thing, but meh … okay …
However, in this case, each of the apparitions said something that only the deceased characters could have known or thought, suggesting they were actual visits from ghosts and not hallucinations, which, again, as writing goes, I regard to be a super lazy crutch. I understand the supernatural has been quite in for some time in Hollywood productions, but that doesn’t mean it’s always appropriate in every circumstance it’s used.
It’s one thing to have the supernatural creeping into a fictional piece like Fargo, and I don’t love even that. But when they impose it on a scene from what’s supposed to be actual history, that is a bridge so far for me that I’m sorely tempted to just bail on whatever it is I’m watching. If either of them show up again to anyone else before the end, like Diana to William and/or Harry, I might just do that.