[sixstringtheory]

> you can cross-reference multiple windows without them overlapping another

This is what people always say about this, but you can’t look at two different monitors simultaneously.

Your fingers are already on the keyboard. Once you get the two apps together on alt-tab order, they are one kepress away from each other, and you don’t have to move your eyes or head at all if they are overlapping or just next to each other in the same monitor.

I do this as well as using a tiling window manager than can be completely controlled from the keyboard, and I am much faster at getting information between different windows than colleagues who have multiple monitors. They spend a lot of time trying to remember where they put the other window, looking back and forth between many monitors many times, looking for their mouse pointer, and also, they too still have to alt-tab.

The farther apart two windows are, like on two monitors, the harder it is to copy text from one and paste it in the other, etc etc.