Uh oh, I sense a good, old-fashioned linen closet spat in the works. We'll REALLY need cake and coffee after this one ;-)
I haven't really looked at a hotel bed in years: I just fall asleep and don't worry about it. However, I've never had an experience where I woke up with all the sheets undone, and the bottom sheet pulled out. That DOES happen at home, from time to time, because I'm not always as careful as I could be about getting the fitted sheet in place, but never in a hotel.
An informal phone poll, conducted just now by me, indicate that big hotels generally still run their own laundries, as they have so many pieces to deal with: uniforms, table linens, bed linens, towels, valet, etc. But they don't want to spend a lot of time sorting and folding things like fitted sheets. That's why they use flat sheets - and I daresay that most who "give a damn" still use flats, they just train their maids on how to properly make beds. Maybe there are some who have made the switch. There's a few hotel people on this site, maybe they can speak to more contemporary standards.
Now, let me stick up for the maids. Maids aren't lazy. If they are, they get shown the door real quick. They're many times rushed or overworked, as hotels load the rooms down with more and more pouf ("heavenly beds" and all that nonsense), but no one - and I mean no one - works harder in a hotel than the maids and the stewarding people. And makes take a lot of grief - the idiots who accuse them of stealing, the horrible people who leave disgusting messes behind, the guests who insist on watching them and trying to tell them how to do their job, etc. I don't know how they put up with it.
Lastly, if there really was a scenario where "one maid can make forty beds per hour", the hotel would find a way to clone him or her ;-)