Ignorance and stupidity are different things though. Hopefully you've positioned yourself in the world where you can avoid the latter but its not always possibl

Ignorance and stupidity are different things though. Hopefully you've positioned yourself in the world where you can avoid the latter but its not always possible. The reason why iterative processes and rapid prototyping work better in models that the author is talking about is because it solves the problem of the client needing to use their imagination. When you can present a prototype to them they can use and then provide feedback it benefits all parties. There is no longer a "what if" in the design, it is there and it can be judged. When the client doesn't like it they can point out specifics and there's less speculation throughout the entire process. No one said design was easy, but bridging the knowledge gap between a designer and client eases the relationship.