Oh, my gosh. When they found they needed to expand the envelope of protection from the MCAS at low speed, that's when everyone should have stopped and said, “Wait a minute.”
Fly-by-wire aircraft can control elevators to control the pitch of the aircraft with finesse. They can gradually, through the control laws, keep the airplane stable. If you don't have a fly-by-wire aircraft like the 737, and the only pitch control surface you can control electrically is the horizontal stabilizer, and you have this actuator that moves it to, say, a quarter-degree per second, that's all you have to work with.