Originally Posted by jim-bob
Yeah, there's a reason. Try pulling a 16-hour day on concrete in cycling shoes. Then do it again, and again. Repeat for a week or so. If your knees and back aren't killing you, you must've found comfier cycling shoes than I've been able to.
Are you a messenger? Maybe clipless wouldn't work for me either if there's a lot of walking to do. But more probably it would. I've been commuting to school for two years now in clipless MTB shoes, wearing them all day every day without a problem. My knees are pretty screwed up from running etc, but clipless shoes cause no discomfort at all. Mine are Adidas Synclines, but Minnrets and the El Moro are pretty similar, as are a dozen other shoe models from Shimano and Specialized, etc.