"Write rich web applications using the latest technologies without having to host your own node.js servers [...] No matter what plugins you use, the output will always be a static website you can host anywhere."
I don't think that's a very common definition of "rich web application".
After looking it up I see it is commonly used to describe something that adds extra features to a browser, like flash or silverlight.
Previously I took it to mean "rich in interactivity". That's what I meant when I originally wrote that, a static site does not mean you can't have interactive content. IMHO the best way to write webapps is to have a static client that consumes an API provided by a standalone backend.
I don't think that's a very common definition of "rich web application".