Part of what makes fiction so entertaining is reading about how the protagonist is special and different, how they are the true heir, the Chosen One who has The Gift, wielder of the Cosmic Keystone, or simply that Badass. They may train to get their skills and powers, but part of their hero package is a certain je ne sais quoi that grants them a better ability or talent at their Serious Business of choice. While it's true that genetics and heredity give us all different advantages when learning knowledge or skills, for the hero it goes far beyond that.