why though?
It doesn't help with auto discovering rss tools, but it does handle the person who right clicks and copies the url of the feed to put in their feed reader.
If it were simply about only showing "smart ads", Reuters could just continue to publish headlines and links without content in their RSS feeds, but they're not.
I love RSS as much as most of older tech geeks, but I'm fully aware it's as relevant nowadays as usenet, and don't expect non-geeky surfaces to support it.