OK, I said "tiling" instead of "window management", I should have been more precise but instead opted to use the same language the parent used. Coldtea claimed

OK, I said "tiling" instead of "window management", I should have been more precise but instead opted to use the same language the parent used. Coldtea claimed that the name tmux was a reference to "multiple sessions, kept open, switching between them, persisting", which I interpret as all the non-window-manager functionality — the attach/detach ability that makes tmux attractive for use on remote machines where the connection might die and you don't want to lose your processes.