Turn off the motor, and the trim is manual. There is a crank right there in the cockpit. If it is too hard to turn, change aircraft configuration to reduce the forces required to. Pilot know how to do this. This pilot stuff, they understand the forces on the flight controls and what impacts them.
Boeing made an engineering mistake. The pilots also made an operational mistake. Unfortunately, both mistakes at the same time were fatal.
I pray that pilot training has improved. And that Boeing has made systems level changes to the aircraft that will preclude it happening in the future.
And that is how aviation becomes safer every year; at a significant cost of customers lives.