Why Office Toilets are always open from the bottom and top?

Why can't they just close all the sides? Is it because people might start Jerking off in the toilet and even if that's the case what's stopping people from doing it even with these open sides?

Image is Stock.

Why can't they just close all the sides? Is it because people might start Jerking off in the toilet and even if that's the case what's stopping people from doing it even with these open sides?

Image is Stock.