… if you know how to use virtual desktops and shortcuts. You can’t look at two screens at a time, anyways.
One use case I can understand is having a 2nd monitor for checking stock prices or checking for a certain event. Other than that, I don’t see how it contributes to “productivity” while working or coding for example.
P.S: Tiling WM users may understand this post more
I think they mean anything where changes happen without your input, because you might see it in your corner of your eye, whereas reference material can be switched to almost as fast as you can look to the side. Typing as you’re reading though…