What if real life stuff happens and someone has to leave the duty, or maybe a number of players are experiencing disconnection issues. I'd much prefer for them to leave the duty altogether if they need to and be replaced by someone who can stick it out until the end. This is also better because since the update that allowed players to teleport to a sealed area, a team can never really worry too much they are going to be a man or two down, unless said player refuses the teleport then that can be unfortunate for the team depending on the role.