[icebraining]

Because sites that distract me from what I'm reading to tell me that there are new comments are extremely annoying.

Sure, you could add, say, auto-loading for new comments when you reach the bottom of the page, or setting the message icon to orange when you get a reply, but that hardly requires a full-blown web app, it's a simple addon to a static site.

[camus]

disqus deals with this issue quite well , disqus will just notify you there are new comments ,it's up to you to load them or not.