The RSS reader in Safari is not a full-featured
newsreader, at least from what I could tell by the demo.
For instance, it doesn’t appear to remember what items
you’ve read or tell you how many unread items you have.
And some of the other features that it does have—such as
RSS searching—are coming in NetNewsWire 2.0.
So… even with Safari’s RSS reader, there is still a
need for newsreaders that do more. (Much more.)