As far as I'm concerned the advantage is I can have three windows (or three editor views) tiled horizontally and each one is the perfect width. A half width (half of 1080p/16:9) is too narrow and a full width window wastes space, but a 2/3 (of 1080p) width window is about perfect. If I tried to do that with two regular monitors, the middle window would be split across the bezel.

*When I say 1080p, I really mean the aspect ratio. My monitor is effectively a double width 1440p monitor, but with the display scaling I use the space is effectively 1080p.