If the aircraft is intact (in QF1 it was), and there is no risk of danger to pax/crew to remain on board then why initiate an evacuation? Whilst true the aircraft was on the 19th hole rather than at an aerobridge, surely it is the sensible thing to have a precautionary disembarkation as opposed to a full scale evac where there will undoubtedly be some dire consequences for the evacuating pax.
Seems quite sensible to me.
SG