Well…when the author wrote the book did they write it to be taught in schools, picked apart for themes and symbolism, and analyzed for historical context and literary importance? Or did they write it to tell a story they wanted to tell? I suspect some authors actually would care if you enjoyed the story as written without knowing what came next. Writers put as much craft into foreshadowing and plot twists as they do into describing the curtain as blue because it symbolizes depression.