Changing Completed Paintings

I just finished making some changes to a painting that I "completed" a couple of years ago. The standard logic warns against doing this because you are going against your initial determination that the painting is finished. I have many paintings that I have completed, but not to my satisfaction. Typically it is a compositional problem. A little time and enough thought will usually allow me to work through the solution, and then I can finish the painting to my satisfaction.