I can work in my office at my workstation. I can walk out to the kitchen and sit down with my laptop and open the lid and be _exactly_ where I just was. I can move across the country and work from my laptop, a friend’s computer, a library, or anything else I run across along the way. My house can burn down and I can go to an electronics store and buy a new laptop and continue typing in the middle of the line where I left off when the smoke detector started beeping and I ran out of the house.
Separating the device I’m using from the work I’m doing makes the friction to move between devices near zero or zero.