In other words, yes, there are people and there are good reasons for wanting this trend to not only continue at Apple, but also at other computer manufacturers.
Lighter, thinner computers mean less packaging and less space, fuel and energy needed to store and transport them. A huge benefit to everyone globally, not just their owners.
Also, while people may not move desktops very frequently, when you do have to do it, it’s always appreciated when they’re lighter and easier to carry. Eg. If you work in IT and have to install them.