I have a home workstation because I do a lot of work from home. Working from a laptop is a sub-par experience because of the form factor. Right now, I'm using a Dell XPS 15 laptop at home, but it's docked to a desktop keyboard and mouse, and a 40" 4K TV I use as a monitor. Prior to the laptop (which I almost never move, bit like that I can if needed take with me), I had a desktop at the same desk. So, right how I'msort of hybrid, but prior to that I had a desktop at home (and a separate, older laptop that I almost never used).
As for "most people", it's important to consider different types of situations, such as families in which there might be a shared computer, or a desktop in the room of one or more children because it's sometimes more economical.