You can also tailor the story to the character.
At the request of my friends, I'm going to be starting Yet Another Ravenloft game at some point in the near future. We didn't have a game Friday because some players were unavailable, so one of the players who was there, upon learning we were going to use Daggerheart and what ancestries and communities were appropriate, decided to make a character. Player decided on the Warborne community--someone who escaped from a war. So I created a war (mortals vs. fey), when I hadn't originally thought of one. Will the PCs interact with the war? I dunno. We'll have to see. But it lets the player play what they want and still fit into the game.