Boeing was right not to document anything, because then they might have to get a new certification (which is very expensive) for the plane, and pilots would nee

Boeing was right not to document anything, because then they might have to get a new certification (which is very expensive) for the plane, and pilots would need more training, which would make it hard or impossible for them to sell this plane to airlines as "just another 737". Remember, a few fatal crashes are worth it as long as it means higher corporate profits.