I am not a pilot, just an interested bystander
says it all really. Yet you are surprised regulators, that know infinitely more on the subject matter than you, have not acted more quickly.
If you perform the memory items as prescribed by Boeing the aircraft will fly trim misbehaviour or not. They are not complicated 10 degree pitch and 80%n1, if while doing that the trim keeps getting away from you and you cannot maintain 10 degrees pitch just override the trim by the disconnecting the switches. Maybe there is a training issue. Why did 4 crews manage to fly their way out of the lion air failure yet the fifth one couldnīt. Maybe years and years of accountants telling anyone that would listen that modern aircraft will fly themselves are coming home to roost. Maybe a 200 cadet should not be doing his training with 150 pax behind them. Maybe Ethiopianīs rostering system is a fatigue inducing disaster. I wonder if China would ground the Comac c919 after two crashes with a fleet of 300 flying. I very much doubt it somehow.