Originally Posted by JLyon
It adds luck because could an ill-timed Double Fault, Lucky net cord, Receiver could get lucky and nail a return. One and done versus giving the player another chance to fight to stay in the game.
There is a reason you see many more 6-5 sets (Tie-breaks with the No-Ad scoring)
The logic is pretty simple when you consider the extreme case. If you had to play a match against Djokovic, would you rather it be a single point, or a full length match? I think your odds of winning are better for a single point match.
If you had to play a match against Djokovic, would you rather have it be a single point, or a single game that starts with a score of deuce? A less extreme example, but my answer is still: a single point.