For those who think that you can simply build something “fluid” or “flexible,” it’s a lot harder than it seems. A lot of the industry jargon comes from print and the printing process; margins, padding, kerning, spacing, etc. There is no such thing as a fluid layout on a printing press (as far as I know :-). So we are stuck with a language to describe design based on a different era. Additionally, in the design phase you HAVE to select a layout/viewport for proofs and examples. Which in turn the client will expect to look exactly right on every surface. There is obviously room for client education and pushback but fluid designs seem like an afterthought in html/css where we are adding new features on top of html/css that are best used in a fixed width based system.