I disagree with the idea that the only way forward for interaction design as a field is to focus on high-level, strategic work. It seems Cooper, and other American interaction design consultancies like them, are finding strategy work more lucrative than actual design, but feel a little guilty for abandoning the craft they originate from. There is a real need for interaction design on a tactical level (call it craft, praxis or whatever) and it is not something to be left to technologists, marketing folk or industrial designers.