One of the issues that came up was that Boeing sold 737 MAXs with an optional safety system that would have likely avoided that crash, so it isn't completely un

One of the issues that came up was that Boeing sold 737 MAXs with an optional safety system that would have likely avoided that crash, so it isn't completely uncorrelated (of course, the blame was still on Boeing for not making that system mandatory, or simply not requiring that pilots be retrained to deal with the lower clearance of the new engines).