Did you read the quote above? "But Mr. Sullenberger said he did not believe that better pilot training alone would have prevented the crashes."
It's a ridiculous statement. Pilot knowledge is exactly what prevented a crash when the jump seat pilot turned off the MCAS in a previous flight of the same aircraft with the same failed sensor.
I don't know about exactly, it might have more to do with being at a remove from the flight controls and instruments and in some sense having a better view of what was going on. I remember reading about a crash, (I think an Air Inda 747,) that was spatial disorientation at night with a failed horizon on the captains side, the cockpit voicer recorder had someone,(jump seater or engineer,) saying something like "not that one, THAT ONE" referring to which horizon was correct.
While I know that a lot of you will disagree, and some quite stridently, I have to say that the commentary here exhibits quite a lot of hindsight bias and outcome bias. These are not character flaws they are just part of a human nature that has equipped us with the ability to be the animal that has dominated the planet and are pretty hard to overcome.
The problem with this problem is that narrative has gotten so muddied and freighted with peoples preconceptions and with politics that it is hard to believe that a dispassionate investigative process is possible as what interstellar body of air safety is going to do it? I believe in the NTSB and I feel that that is where the best accident analysis will come from and the best idea of how to fix the problem. Unfortunately this is story with legs and there are, in my opinion, a lot of dishonest actors involved and so a mangled story that seems to flee from nuance is what we are left with.
If you are interested in accidents of a complex technical nature and human error here is a book:
https://www.amazon.com/Field-Guide-Understanding-Human-Error/dp/0754648257