Map and chat apps are the ones I can think of right now that is better as a single-pager. I have been writing web apps for over 10 years. They aren't single-pagers, yet everything is a "3-8 KB request" and happens in "about 50 ms." There is never a time at any point where "2-4 MB" is needed. Now perhaps you are thinking these are ugly, and it means little to you if I claim that they aren't. All I can say is before I was a programmer I was a graphic designer, and I still like studying and thinking about user interface design. Oh, and my customers have complimented the look and feel of my apps, without solicitation, many times through the years.