Absolutely right with this article, I’ve held on to this opinion for years. My initial thinking was led by Fog Creek but also by Campaign Monitor’s office redesign where they also went for private offices.
One small comment, I think it’s misguided to think that only coders and designers need to go into the focus zone. I think it counts for every job. Marketeers and sales persons sometimes also need to dive into their focus zone. I do a bit of every job around our design office and the absolute worst time to interrupt me is when I am writing a sales proposal.