A programmer is not a designer. Both are completely different fields. What you are saying is that a shark(programmer) cannot fly like an eagle(designer). But it sure can swim. And vice-a-verse.
Hmmm, no, to mimic the analogy I am saying that just because something has teeth doesn't mean it can bite like a shark. Just because something has wings doesn't mean it can fly like an eagle. A budgie with a jetpack, however, can probably fly better than an eagle. Or something.