The Boeing problem is not a single technical issue, it is a system failure of the management including specifying, design, verification, validation, quality control and certifying.
Looking backwards, there are some obvious flaw of the MCAS system on the very early specifying stage, and none of the later management process including FAA checking caught the problem.
If those management system issues cannot be addressed by Boeing, then I expect more and more issues will be discovered, some may more serious than the MCAS system flaw.
Boeing is still trying to limit the issue in technical level which is the most dangerous thing.
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