I've seen some situations where "web designers" without any knowledge of html/css were producing designs that look more like they are for print, not for web. I

I've seen some situations where "web designers" without any knowledge of html/css were producing designs that look more like they are for print, not for web. If you want to make the workflow smooth and productive, the designs need to be realistic and properly layered so the web dev can do the work better and faster. I don't really see that happening in a situation when the designer has completely no clue about html/css.