The 777 and 787 are full fly by wire. The control system has all the sensor inputs, all the actuator outputs, and a model of how the aircraft is supposed to behave. If the aircraft isn't doing what's expected, the flight control system will fault and drop to a dumber control mode, giving the pilot more control rather than driving control surfaces to their limits trying to correct the wrong problem. Those systems are managing trim, like MCAS, plus a lot more.[1]
MCAS is dumb. It has few inputs and one output. It has no overall model of aircraft behavior. It just detects a bad angle of attack and cranks the trim to bring the nose down.
The 777 is supposed to handle like a 737. The cockpit controls are reasonably similar, although different enough that transition training is required. Unfortunately, there's no "small 777", a gap in Boeing's product line the 737 Max was supposed to fill. (Or small 757, 767, or 787 variants. How did they go half a century without a new sub-200 seat aircraft?)
MCAS is dumb. It has few inputs and one output. It has no overall model of aircraft behavior. It just detects a bad angle of attack and cranks the trim to bring the nose down.
The 777 is supposed to handle like a 737. The cockpit controls are reasonably similar, although different enough that transition training is required. Unfortunately, there's no "small 777", a gap in Boeing's product line the 737 Max was supposed to fill. (Or small 757, 767, or 787 variants. How did they go half a century without a new sub-200 seat aircraft?)
[1] https://www.linkedin.com/pulse/analysis-boeing-777-fly-by-wi...