Matthias Ott is an independent user experience designer and developer from Stuttgart, Germany. Besides design practice he teaches Interface Prototyping at the Muthesius Academy of Fine Arts and Design, Kiel.
This is a very important article and anyone working with the #web (developers, designers, project managers) should read it carefully.
If in the past, #CSS was the limiting factor in what it was possible to achieve in the web, today it is design tools which hold designers back from embracing the full capabilities of the modern web platform.
Great article, and a hugely important point to make. It's also why tools which try to abstract away CSS with their own DSLs and paradigms are doomed to failure in the long run, because they're going against the grain of the web platform.