Unfortunately, I like to write my content knowing how it's going to have a certain appearance and layout, and because this doesn't scale to the narrow set of HTML allowed in the <description> tag, I don't have anything in there and just have a link to my site.

There are definitely RSS feeds without content so you have to go to their site and have adverts thrown at you, yeah, but it's not as simple as flipping a switch and having readable content in your RSS feeds.