I'm not as up-to-date as I need to be, but isn't the idea of truly semantic markup and RDF and microformats that Instapaper (and many, many other sites) won't h

I'm not as up-to-date as I need to be, but isn't the idea of truly semantic markup and RDF and microformats that Instapaper (and many, many other sites) won't have to have site-specific parsers? Now, I recognize that a) Instapaper can't do anything about that, and b) the vast, vast majority of sites are unlikely to change. So I guess the main question is: if you have really good semantic markup, do you need this, or will Instapaper already handle your stuff correctly?