> They are fun, but they are useless as they never happened. There is no point thinking about them besides playing with your imagination.

Just because something happened doesn't mean it's useful to think about. Conversely, just because something never happened doesn't mean it isn't useful to think about. I've read fiction books that made me examine my perspective or way of life in a way that nothing else has, and I've read non-fiction books that didn't register a single change in me.