Can't we all just get along? :D

I happen to agree with the people who are annoyed by the lack of a date. For most technical topics I research, I want to know when the article was written. Even for nontechnical topics, I generally want to know if the article represents the author's current thinking or something more distant.

But I'm not most readers, and like tptacek pointed out I'm certainly not entitled to a date on the post. Since I am unlikely to hire the writer, optimizing for my happiness is not exactly expected here. Of course, if I were to be looking to hire the reader, stale content isn't really going to bother me. It could of course affect if I see the content at all (via a search), which I expect may be one of the larger points here.