Aviation Week has a long (4 page) piece about lessons learned from the Boeing 737-MAX crashes and subsequent grounding. I was expecting to read of some clear general principles that everyone (Boeing and the world wide aviation safety organizations) accepted and would follow in the future. Dream on. They listed some petty quibbles. They said company tech reps should have less input on regulators deliberations. Europe and Canada and pilots unions were OK with 737-Max aircrew shutting down the stick shaker by pulling a circuit breaker. Brazil and FAA didn’t say anything on this issue. It was pointed out that pilot training was aimed at experienced US pilots. They said they would aim it more toward in experienced third world pilots. FAA made some changes in the way they do paperwork and the way they organize technical expert committees.
All in all, an underwhelming list of achievements.