My reasons for using something like this would be to import my Delicious rss feed as a sort of "What we're reading" feature. One of the reasons I'm not just posting each link to WordPress is that I don't really want a bunch of posts with just a link and no input from me. Therefore, I wouldn't want to create a post for each and every feed item. I'd rather have one post with all of the latest links. A sort of "Link Dump" or "Link Roundup" post like some blogs do.
From the description I'm guessing it can be done manually with a shortcode but I'd like it to happen automatically once a day.