That RR Trent 1000 again... a year ago, ANA grounded its 787 fleet due to turbine corrosion/cracking.
At the time the NZ CAA released a statement that it
"was closely monitoring the action Air New Zealand is taking with Rolls Royce and is satisfied the necessary steps are being taken to ensure the ongoing safety of the travelling public."
The big twins gained acceptance for ETOPS because engine reliability had improved.
Mmm I never want to be aboard a big airliner with half the power out, somewhere over the Pacific.
What was that thing Virgin said, before they dumped the A340's?
4 Engines 4 Longhaul
So the A380 is my choice of ride for anything beyond a jump over the Tasman.