As kaspy points out in his, this is just more software engineering hubris playing out. I took architectural drafting classes in high school, and there are tons of technical differences and considerations that go into building design. And I was only dealing with drawing them, forget about having to have all that in my head and actually being able to make decisions on it.

To make what I hope is an apt analogy back to software, you are basically saying, "Oh, their job is easy. All they have to do is follow established design patterns!" But, of course, we also have design patterns... Why don't we say the same thing about ourselves? Because we know that that's complete bullshit; there's a lot of thought and wisdom that goes into actually building stuff around those patterns.