Why ? Most office workers for example only untether their laptops when going to meetings. They are every bit as "power user" as those who use a 15 inch laptop.
Interesting. I guess my workflow and concerns are a little different since I often work without benefit of an attached monitor, and my meetings start by logging into whatever computer is in the conference room. If I'm at my desk, I'm working on hardware that's well beyond what I'd expect from any laptop.
The 'thinner, lighter' perspective just doesn't fit well with my particular requirements.
Users that rarely use their laptop on the go do not have the same concerns as me.
I found this review to be written with half the enthusiasm as his 13" model review. Maybe this is the reason :)