Some on this thread have suggested that MCAS May have been added to compensate for an elevator authority shortfall. That is not the case. This function was added to address a pitching moment vs AOA issue. With autopilot control of stabilizer to address a speed stability issue (aka STS) already in place on earlier 737 models, adding MCAS was relatively simple. Adding a stick pusher would have been a lot more complicated and would have involved new hardware.