Why does every layout, template and site-builder tool assumes all websites are a three-page thing, with big blocks of images and one or two products? Do you ac

Why does every layout, template and site-builder tool assumes all websites are a three-page thing, with big blocks of images and one or two products? Do you actually visit such sites on a daily basis? Last time I did it was a page for a hip local barber shop. How about a bit more complexity for the sake of realism?