Words shape thoughts. For example, what is the defining act of sex? When have you moved from making out and heavy petting to doing the nasty? Most people would say the act of penetration. And who penetrates? A man! And who receives? A woman! What does this imply about the power relationship?
Metafiction is the narrative quest for narrative, an attempt through stories to understand what stories are.
Why do stories matter? Because we are stories.