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"Don't leave anything to chance!" is a refrain that we hear constantly. But in our concern for control, we do all we can to eliminate "the luck of the drawer" which just might work better.
 
At a very prosaic level, I would say that trying to second guess fate and request a roommate in advance might just backfire. It might be actually be better to go with the flow and actually get a roommate who is truly your family away from home.