At rehearsal, the actors developed backstories for their characters.
Megan has a hard time being vulnerable because she doesn't want to burden others with her harrowing backstory.
Throughout the series, McCaffrey puts scientific backstory behind her world.
The story actually begins months before the plot of the movie does, filling in backstory and other such details that will delight fans and educate newbies.
Sure you have a backstory, but who really cares in a racing game?