I can have a giant monitor in any room of the house when I'm working from home
I can get a stealth giant monitor at the coffee shop without looking like a freak (by using laptop mode but placing keyboard in front of lower screen)
And I can have a single PC I use for everything, no juggling files, no messing with docks, no messing with USB monitors (that require random reboots because of connection issues, or cause Windows to randomly reposition my apps all the time)