Perhaps it is something to do with the approach lane safety domains? Civ ac performance is based on them being at 50' crossing the threshold on an instrument/PAPI approach - whereas I was always taught in the mil, that if you were conducting a visual approach, the domains were safe enough for you to land 'on the numbers' from a 3 deg approach. These days I just do as I'm told and follow the PAPIs/ILS!!
Perhaps an ATCO could tell us if there is a difference between civ and mil rwy safety-domains?