Websites without mobility means that you only get to see a fraction of the site at a time. The whole site is available but text is small and difficult or impossible to read on a smart phone. The solution is a whole lot of pinching, zooming, and all around scrolling. This becomes frustrating because it's easy to get lost on the page unless you already have the layout memorized. It will take a long time to scroll around and find what you need. Not to mention it can make you sea sick! Most people who look at these sites on their phone eventually give up and go to a competitor's site that works better.