Agreed - I understand the point of the article and that my post does not directly address that point. But it does challenge OP's statement (which I italicized)

Agreed - I understand the point of the article and that my post does not directly address that point. But it does challenge OP's statement (which I italicized) that he uses as a basis for his conclusions. I fully agree that iterative analysis and development is usually quicker than the waterfall method. I'm just adding that a little thought each step of the process can make everything quicker. If you think things through enough (which more experienced people often do better), you can have your cake and eat it too.