Check out a related video.
The other link I came across was this, where the author makes a clear stance for single monitor setups. Over the years, I have seen people (mostly on TV, but also IRL) looking at multiple monitor screens for their design/programming/hacking work. They think they are multi tasking. But I am not one. I am an efficient single tasker. A single monitor to look at helps me maintain focus. And attention. And a huge part of day to day work involves deep work, where I have to spend multiple hours looking at a single file. Specially helps when I have move my latop between rooms.