This web site is interesting...
A quick look tells me that this is not hobbyist friendly at all. You have to buy a Raven USB stick, but there is no API support, you have to roll your own code to make sense of the 802.15.4 protocol stream before you can even begin to work on the level of devices or events.
Like I said, tell me how to turn my outside lights on at sunset in the Zigbee world. How to I address devices and send commands to them? How do I get status back. X-10 has a flaw in that it's hard to get command confirmation and device state back. So we learn to live with that. But I'm not seeing a compelling case for Zigbee being any better.
Bottom line is the people who write for CE Pro and similar magazines have their own slant on things. And it's a very different slant from Popular Electronics or BYTE or any of the publications that used to show you how to unravel things and make them work your way. And that's what makes HA fun for a lot of people.