I want to hold an opponent to 44 instead of 45; I’ll go into the seven to keep him off of 45.
I don’t want the opponent at 61 from the head or 68 if I can make him chase a seven and only get to 67.

If you think about it there are a lot of places where one point does make a difference and that one point may be gained at 29 instead of 30.
Many players start counting to late in the game.