Basically no jet engine at any airliner are mounted at a point which is well-balanced in all flight situations. At level flight, the 737 MAX is also well balanc

Basically no jet engine at any airliner are mounted at a point which is well-balanced in all flight situations. At level flight, the 737 MAX is also well balanced. That is just a matter of weight distribution in the machine. The problem appears at high angle of attacks, that means the force vector isn't pointing vertically down as it were only due to gravity. In this situation, the balance of every aircraft which has large engines hanging down from the wings does shift and needs to be compensated for in some way in the control systems.