After a certain point, Saul adopted this as his central philosophy. He liked the idea of consistency and rolling averages.
But the biggest problem with always taking the middle road is that "A" (Never), "B" (Sometimes) and "D" (all of the above) have something to offer, too.
When you phase out all decisions and let your life ride on conventional wisdom, you inevitably run into more serious problems than penciling in an empty circle.