“Fiction reveals― Ralph Waldo Emerson
truththat reality obscures.”
We could leave it there and be done, or we could parse that out a bit more.
Jordan Peterson, Sam Harris and Brett Weinstein discussed the idea of a metaphorical truth. They defined it as a notion that is literally false but conveys benefits to the person who acts as if it were true. Their example
So myths, stories from religious traditions, and even modern movies like The Lion King, use the story as a foil to convey a deeper truth that non-fiction would have a harder time getting at.