Why do parents send their children to their rooms when they have all their funny stuff there?

when my 6 year old son misbehaves i have him sit in front of me til he is doing better but i think some parents send their children to their rooms so the child will be away from the parents. because the true punishment is that the child is away from the parent ;( in their rooms the children can play but they are sad because they are not in the room with their parents and for whatever they were upset about