I have a relatively high-end desktop with a nice monitor. I also have an aging laptop with a tiny screen and an anemic amount of RAM. Most of my computing ends up being done on the laptop.

With a family and a kid, it turns out I’d prefer to spend most of my time at the computer in common spaces; at the dinner table, on the couch, etc. so that I’m present and available for my family. This is far better than squirreling myself away in a room.

(Note that for work, I have a different computer, I’m talking about for life outside of work.)

Even multiple rooms in your home is compelling enough for many people, but for me it's about taking it on trips. Obviously you don't always want to take your computer on vacation, but sometimes I want to visit a friend and work from there, or go visit my family and work on a project while I'm there, that kind of thing.

On a smaller scale, I often bring my computer to the roof of my building or to a library or cafe. I can understand preferring the constraint of "when I leave my desk I don't have to think about the computer anymore", but for me all the additional flexibility is a good tradeoff.