I for one will never question a pilots decision when he is on the hot seat but, two thoughts come to mind :
1: I thought that any 4 engine A/C can continue to destination “fuel wise “ by design .
2 : I remember “vaguely “ there was a recommendation by Air Bus not to fly a 340 for instance on 3 engines more than 7 hours due to lubrication issues if the engine did not seize .
can any one confirm this or deny it ?
Thanks