The plane cannot be certified without MCAS or some other stability augmentation. This is not unusual in itself, almost every jet aircraft has some kind of instability. The problem was that MCAS is not reliable and doesn’t fail safe. The fix they’re testing actually makes it less reliable, but when it fails it will disable itself instead of making a smoking hole in the ground.
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The plane cannot be certified without MCAS or some other stability augmentation. This is not unusual in itself, almost every jet aircraft has some kind of instability. The problem was that MCAS is not reliable and doesn’t fail safe. The fix they’re testing actually makes it less reliable, but when it fails it will disable itself instead of making a smoking hole in the ground.