Sometimes, it's better to leave unsaid unspoken. I agree. There are just those cases in life in which holding your tongue would produce better outcomes in the long run.
But my friend and Dear Reader, let me tell you that I have generally found that clearing the heart, mind, and thoughts of the things that should be spoken is a rare jewel. Whether good or bad, I believe that honest feedback is a tool in creating a great man or woman of God.