Monobaths do find limited use in specialized applications, ie the Poloroid camera is based on a monobath. But for general purpose use they have no real advantage. A monobath depends on the control of two competing kinetic reactions; development and fixation. Unless the two processes are finely controlled the resultant images will be less than optimal. Monobaths became only practical with the use of Phenidone or its derivatives. The negative produced by a monbath differs from a conventional one in several ways. For those that are curious get Haist's book as he explains the differences fully. For example the image of a monobath negative is limited to the surface of the emulsion and does not penetrate very much into its interior. This acts to increase acutance.