I think they're idiots. Really not a valid reason to run a circa 2001 MS (read inherently insecure) OS in 2014. None whatsoever.
Windows XP set a HORRIBLE expectation for OS longevity.
Just because Windows XP lasted as long as it did doesn't mean every OS should be expected to last that long.
Technology moves at such a fast pace that updating an OS at least several times a year (if not more frequently) should be considered a normal part of safe computer usage.
Using Windows XP that long was like using a really old car. It looked great when it first came out, but instead of upgrading to a newer (and safer) car down the road, you repaired that car over and over drove it into the ground, figuratively speaking.
Think that if you wish. But at the end of the day Microsoft chose to support XP and the rest of their OSs for a longer time. Windows 98 didn't lose support until 2006, Windows 7 won't lose support until 2020, it isn't just XP getting this treatment. And at the end of the day, regardless of how old it is, you can boot up a 2001 XP PC and still launch the latest versions of iTunes, Chrome, Steam and many more, all functioning fine. OS X Tiger can't run any latest versions of them, making it increasingly useless in the modern world. For a computer that cost 2-3x more than the Windows equivalent, that is bad.
Personally, I dislike Apple's continued software support lifecycle. It was far too short, but at least the blow has been softened with free OS upgrades.