If every aspect of the game is known at the start, there will be less tension (CalculatedRisk) in each move. If the game is the same every time, Replayability may suffer.

One of the FourteenFormsOfFun, and also called "Exploration and Discovery" in Better_By_Design?, March 2002.

Discovery manifests in a plethora of ways:

Therefore, give players something to discover in the game as a whole, and with each time it is played.