I disagree. You're right that there is of course no clear separation (the opposite also being true: most complex web applications will contain text content), but the differentiator is when the application side becomes large and complex enough to warrant a change in paradigm. Doing that for a little blog menu is overengineering.
Every page starting at the application paradigm, and explicitly changing when displaying text would fit almost all the cases better than application and text markups that don't talk between themselves.
