WP is a perfectly fine tool for many scenarios. There's something nice about having a blogging platform that's easy to install and use. The problem I see if that this blogging platform gets shoe-horned into a CMS-like role with half-assed extensions and modifications, many of which are written by amateurs running a freemium-style model and often have little to no community source code review. I find popular extensions are okay, its just when you start looking at more obscure stuff because now your WP needs to be Drupal-light and SugarCRM-like that you run into trouble. WP is pretty much a victim of its own success. Lots of people have made sure the Wrong Way to do things is easy in the WP ecosystem and that hurts the core product.
I'm really surprised to see a site that gets as much traffic as Wired using WP. I could see Drupal taking this role. Drupal, of course, is not without its faults. I've been part of a few Drupal roll-outs and have done development on it, and my god, there's an ugly learning curve here. If money is an issue, you can get a decent WP dev a lot less a Drupal shop would charge you. I imagine Wired, being a print magazine in the age of dying print, probably didn't have a big budget.
Personally, I'd love to see something as solid as Drupal but with the ease of WP. Maybe this middle ground is impossible, but it would be nice to whip up a Drupal instance and have certain roles or templates ready to go, like WP does. Instead, stock Drupal is pretty much nothing out of the box and the dollars/time involved to make it something usable and finished can be significant.
>an average of four cookies for every visit (which messes with some caching attempts)
That's a trivial fix in Varnish. I run Varnish in front of WP for my own personal blog.
>, I can tell just from your headers that you're running on Apache 2.4.6, on PHP 5.6.6, and using Varnish 4
If that's the worst sin they've committed, then I'd say they're doing pretty well. Securing WP isn't that tough. I find most LAMP apps are security nightmares and WP is just the posterboy for this and because of its popularity gets all the attention. If you're not running an IDS/IPS and locking down WP, securing permissions on your server, running SELinux, etc then you're just asking for trouble.
I used to feel pretty confident about Drupal from a security POV until SA-2014-003. Considering how bad that was, it scared me a bit and makes me wonder why no one can make a CMS without major security issues in this day and age. I need to do the same amount of locking down with Drupal as I do WP. From a server admin role, there's not much difference between the two. I still need to do all that security stuff and admins who say, "Oh Drupal is secure I dont need to do that stuff" are the ones who are going to continue to get burned.