One lesson which the industry has to learn from this is that all flight crews must know how to restore orderly flight and disable all automation in the case of misbehaving flight control systems. If that's not possible, the cockpit is no longer a place for human beings.
The other lesson would be why on earth are pilots having to do this in the first place? Why are manufacturers building 1960 era aircraft?? Why did Boeing hide knowledge of the MCAS? Nothing else in the world would be built to a 50 year old design yet somehow in aviation it is acceptable.