As a minor response, I actually think that the web app approach can be right for some blogs and "boring" content based websites -- if your goal is to lower user wait time or GUI latency, and if you're okay with making tradeoffs elsewhere (more data requested, heavier initial payload).
Why? Because after the problem of initial load, I think that further web requests are among the most expensive things you can do in terms of user wait time or latency, and that if you only start moving at the very time of user request, then it's too late to prevent a moment user waiting.
Why? Because after the problem of initial load, I think that further web requests are among the most expensive things you can do in terms of user wait time or latency, and that if you only start moving at the very time of user request, then it's too late to prevent a moment user waiting.