My favorite rabbi is a rebbe, Rebbe Nachman of Bratislav. He was a spiritual storyteller, prayer warrior and died 200 years ago. He was initially intrigued by Kabbalah, being a descendant of Baal Shem Tov, but dropped that particular "spiritual superstructure" in favor of humble simplicity.
So yes, imaginary entities are wonderful creations of human beings ... but they aren't epistemology, they are aesthetics. I agree with my Rebbe, that speculative metaphysics is ... questionable and arrogant. If I created a story ... and someone doesn't appreciate it, then they can listen to another or make their own.