this question has been asked numerous times over the years so have a dig around in the archive.  but my general answer is teach set plays so each player learns where they should be running to, to receive the ball and to open up the court.  this includes set plays off the centre break, and set plays off the back line.  the set plays are very standard and most coaches all use the same ones, but it isn't to restrict the players from making their own choices, it teaches them where they should be going.

hope that helps