I think the core consideration is that software isn't static, and a machine that is held together with chewing-gum and silly string can produce the correct output and be a terrible machine at the same time.

What happens when it breaks? What happens when you need to produce doodads as well as gizmos, or a different size gizmo is desired? Who wants to reach inside the silly string and hope for the best?

I'm reminded of that old saying that even a broken clock is right twice a day; an overly complicated piece of software that produces the correct output is only coincidentally correct. Which I think is the point of the article.