This is where a lot of the problems come from. To many "designers" think that they're also usability experts and information architects. The main problem comes

This is where a lot of the problems come from. To many "designers" think that they're also usability experts and information architects. The main problem comes from the fact that those disciplines can be subjective in their nature. A lot of decision making in those roles is about personal "opinion" as in; "Well, I think the search box should sit in the top-left corner of the page". What's easier than stating your opinion? And we all love doing that. A lot of employers simply do not understand this.