Its the trade off of continuing on three to destination or somewhere else down route vs landing at 560t (190ish t) above landing weight) vs flying around to reduce weight (still going to be over weight as the 380 won't dump to landing weight). Two ENG drift down still clears all the hills in oz. The curfew at Sydney is a pain in the arse, maybe better options for pax and company at PER and SIN.
Its nice to have options. Think 10 sqn even shut em down to stay in the air longer Centaurus. But it was never the same when it left TVL.
The don.