As previously stated the autoland works with any ILS no matter what category. Interference from taxiing aircraft, etc is not protected. One day landing with smoke in cockpit on a B757 I coupled up as an autoland on a Cat 1 just as insurance in case the situation deteriorated during the approach so the plane would land and stop itself. Once we knew it wasn't needed we shut it off. Why not use every tool available in case TTTS.