Engines were mounted to make a stable configuration inherently unstable in not so uncommon circumstances. The pitch was used to control the the most critical ax

Engines were mounted to make a stable configuration inherently unstable in not so uncommon circumstances. The pitch was used to control the the most critical axis of the plane - something done normally with the rudder. This gave an automated system the authority to override the pilot with a wide margin. The behavior of the plane differs wildly from the old 737 as soon as the surprising narrow corridor of normal flight situation is exceeded.