[anbop]

No one said it does. But if you tell someone "fix whatever is causing the disks on this machine to fill up" they're going to be more motivated to do so, and more able to make the best decisions about how to do so, if they know what the purpose, or "story," is, that they're a part of.

It's just like if you told someone to play the part of a random extra in a convenience store in a movie, they will do a better job if they know what the movie is about. Even the way you play an extra is different in a slapstick comedy vs. a movie about blood diamonds, for example.