Seems to me there a plenty of reasons to have the laptop open and not powered on. Cleaning (as the OP wants), setting up/positioning in workspace, plugging in/moving peripherals, all in preparation for work at a later time.
It’s true that you can do such things while powered on (if forced to), but for a company so publicly concerned with impact on the environment, having the option to use 0 energy while doing such tasks by providing a traditional “powered off means OFF” state seems like an easy thing to do. Kind of stupid not to, really.