OK. I understood what you are doing concern. Fortunately, I was not be encountered in case the article is updated with typo / link as my comments. Most of the time, the contents of the article had been added. Finding a universal answer is difficult indeed.

There is no way yet to see that article was updated. Most of the time when article is updated it's a fix of a typo/link. I'm trying to minimize number of distractions in reading process. And I'm not sure that additional note about article modification is necessary.

I see. Your decision should be respected.
By the way, in that case, how do users notice an article that has been updated? Functions suitable is mounted on bazqux?

I still don't like idea of resorting articles. Even if it will be based on modified time from XML.

Maybe, I think he want to say that's based update <modified> or <dc:date> that is described in the xml rather than day bazqux acquires the article.
For example, it is possible if feed-reader of IE. However rss-reader of cloud most do not have this feature. Also Google-reader.

I'm not sure that it's a good idea.

A week old article can become today's one after update and it can be quite confusing. There are also feeds that include tracking codes that are changed on every feed fetch. All latest posts in such feeds will have the same time and it's also very confusing.