I agree with the author. Having just built a very large responsive website, every new update / feature is (almost) mulltiplied in complexity by the number of devices we support. Especially when the feature is doing complex interactive stuff. For instance, we just built an interactive newsletter reader with drag-click-slide whirling html5 shaz that i ended up having to do 3 version for in css & js on Tablets, Desktops(plus IE), and phones. What I'm wondering is how to monetize as a devloper in the long term. After a year or so experience now I'm definately seeing that a one time up front bill for a mobile version does not cut it.