Put a Date on Your Blog Post
observationalhazard.com
observationalhazard.com
For all the reasons cited by the OP I'd like to endorse the idea.
And don't make it half-date either. It's even more infuriating seeing something is written on "May 1st" with no year!
- 2+ year old articles (2012), removing the date in the URL tripled traffic. - for recent, same year (2014), date removal was a marginal difference either direction.
My advice would be, if your article has a long shelf-life (like an article comparing PHP's sync nature vs. Node's async nature, since this is doubtful to change), an old date can inappropriately put a shelf-life on your appeal.
If you're writing on the 1.0 release of Angular and how you got around an annoying issue, that date will save me from copy/pasting your solution :)
Wordpress, Blogger, and Tumblr have been displaying time stamps on default themes since the beginning (although some require the user to mouse-over a truncated time-stamp, which is annoying but a compromise).