It is noticeable that this turbine generation change seems more problematic than the last one. Almost all manufacturers seem to be effected one way or another. Be it RR with the 787, GE with the new 777 or PW with the A220 they are all struggling. I am quite relieved not to be flying one of these fancy new jets particularly on long etops sectors. I don’t want to tempt fate but the one ultra long haul twin that seems to work out of the box is the A350 which of course has another version of the RR Trent. So it seems to vary even within engine families, with differences such as blade coatings etc.