That's not quite correct. When the aerodynamics of a plane was not designed to push forward the mounting of the engines, you have more reinforcement. That alone

That's not quite correct. When the aerodynamics of a plane was not designed to push forward the mounting of the engines, you have more reinforcement. That alone causes an uneven distribution for lift not accounted in the design itself. THIS is what causes the plane to nose up. But that doesn't mean stress is not put on the frame itself and mechanical parts that will be, on a daily basis, "abused" to the point of metal fatigue. You see, when it comes to aerodynamics, it's easy to test it on a simulator. And it seems boeing's 737 max passed with flying colors. Then, it had to fly. That's the moment when test pilots came to a conclusion that the design will not work. Boeing's solution was a software "fix" and it needed to relay on 1 sensor to pass certification. So, what do you have? NO TRAINING on this airplane, a bugged software system, poor aerodynamics, poor design choice, stress on elevator, etc. The ethiopian airlines plane had such force that pilots were not able to manually turn the trim control wheel. Do you know how much force that plane had to have that the jack screw couldn't be operated manually? THAT is a severe design flaw. THAT is what is being investigated. Who is investigating Boeing? Boeing is investigating Boeing. Boeing on 5/7/19 admits it knew they had a severe problem but it can still be fixed. Who certified the fix? Boeing. But now the FAA is investigating that fix which was promised by April. Again, this is a severe design flaw with still many unknowns yet to be found.