Fiction I think is much more important than non-fiction. It explores the human condition and the nature of reality. It’s been shown that people who read fiction more are more empathetic. The reason is clear - reading puts you in the mind of another. It allows you to visualize their perspective.
This is not only good generally because empathy makes the world a better place, it’s even good in a machiavellian sense because the better you understand humans the better you can manipulate them.
There’s a quote by Twain I believe where he says something like “Fiction is much more real than non-fiction. Reality doesn’t have to make sense, but fiction does”