Are we talking about 140kt aeroplanes? A V1 reject in Cat3a conditions is frightening. As for much lower conditions, forget it- you are in significant danger of losing directional awareness unless you keep your head and use the localiser. Landing manually in Cat 3, in a 15 kt crosswind on a wet runway and 200 metres visibility, without the benefit of your usual horizon and end of runway cues.......difficult! And people question 'captain only' requirements!