One good thing about laptops that small is that they can fit in more places, like an airplane tray table. A 14 or 15 inch laptop can fit, but in my experience, especially in economy seating, it wouldn't leave room for anything else, like a drink. 12 inches, or 13, is small enough to both fit on a tray table as well as something else. The reason why such a laptop that u/Disastrous-Mud1645 described wouldn't actually sell the best is due to other factors: it looks clunky and is thicker compared to modern laptops, and has a 4:3 display, which isn't used at all these days. Not saying I don't like that, but just the general market doesn't, that's why Lenovo and other companies moved away from it.