I think a more fundamental reason is that PubSubHubDub solves the problem "I used to use RSS to read articles, but the 15 minute delay between the article being

I think a more fundamental reason is that PubSubHubDub solves the problem "I used to use RSS to read articles, but the 15 minute delay between the article being posted and me being able to skim it in my RSS reader was unacceptable" and that this is a problem real people do not have.