OP you clearly have no clue what you are talking about. Safety if number one reason, slamming the open-door in people walking outside the door is another. You can defend against someone forcing their way in, by using your body weight against door, something you can not do if it swings outward. Odor control is another issue, door swing outward will release the smell into next room, rather than contain it with the swing inward. Finally, this has nothing to do with architects or interior designer, this is a building code bylaw, as accessibility demand the door swing inward for people in a wheelchair so they can operate it.