I've met many people who seek to add to a product and enable an endless assortment of new features and functionality. This often goes beyond the original intent of the design. Some believe that a design is complete when there are no more features that can be added.
To me a design is complete when it's simple, elegant and exactly what the customer needs. A design is complete when there is nothing left to remove. Said another way in one of my favorite quotes:
"Make everything as simple as possible, but not simpler." - Albert Einstein