This is not a substitute for experiencing things firsthand, but I can certainly point to many novels that shocked me into thinking about stuff differently.
Good fiction reaches you in a strongly empathic way, in a place where you're uniquely receptive to it. This is valuable for teaching things about your own life and the lives of others, which seems valuable.
This one is tough for me.
Must all of life come down to having something to show for it?
What about those pockets of our existence where we can just _be_ and enjoy something for the sake of that enjoyment?
And if people stopped enjoying fiction, what motivation would there be for others to write if they had no readership to show for their work?
Productivity is a good goal but we're slightly more complicated as people than simple, single-purpose machines