Sounds like QF uses more restrictive limits than other operators -
Slight differences between aircraft types but the limits used are:- 15 knots X-wind with greater than 300' cloud base & 1200m RVR, 15 kts X-wind (dry) 10 kts X-wind (wet) below 300'/1200m RVR, 10 kts X-wind Dry or wet (incl gusts) below 200'/600m RVR. Also max 21 kts headwind & 10 kts tailwind. As the system was originally designed to permit landings in fog then it is unnecessary to develop the capability to full aircraft limits.