I believe these types of articles only serve as a distraction. They are popular and get a lot of press. Even if Wordpress had 99% of the webpages it doesn't make it a better product than ProcessWire.
I have used Wordpress and Joomla for customer sites, in the past. They were a tool that got the job done, then, because I wasn't aware/knowledgeable of better tools.
Since, I have discovered ProcessWire, I now know that those tools aren't appropriate for seriously developing websites or web applications. They have great strengths but also many technical weaknesses.
Anyone who seriously compares Wordpress, Joomla or Drupal to ProcessWire and then states that technically those 3 are better, is not dealing with reality. I could spend the next year learning about all the remarkable things you can do with ProcessWire. I now believe the only limitation is your imagination.