HH,
All engine manufacturers are pushing the envelope (s)very hard - delays on delivery /problems on new engines from all the major players
Nothing new in your observation, going way back to the introduction of the 747 by Pan-Am. It's known as progress and as often occurs, "The best laid plans of mice and man often go astray." What is new is the instant news made available by the internet and on-line sites such as this one. Bet you never saw the newly introduced to service Pan-Am 747s parked at JFK with cement blocks on the wings because of lack of engines due to a HPT technical problem.