because the person across the room isn't your freind he is a co worker. been through a few ground schools never shared a room and never failed a checkride. if you think sharing a room will help you pass a checkride i guess you can keep thinking that. what if that person snores like a chainsaw, has a different sleep patter, doesnt flush after dropping a duece, what if you just dont get along with the other guy. the list is so long why you shouldn't share rooms. not to mention it is a really big sign of how well(or bad in this case) the company treats its employees.