The issue here is that certification rules require that increasing pull pitch controller input must be needed to command ever increasing AOA / normal load factor. Without MCAS there are 737MAX flight conditions where AOA / normal load factor can increase with constant column pull such that the pilot would need to relax the pull force in order to avoid exceeding their target nose up pitch maneuver. This characteristic does not comply with certification requirements and thus MCAS was introduced to assure that a steady increase in AOA / normal load factor requires a steady increase in column pull force.
Putting the certification requirement to one side, would a pilot actually have much difficulty with control if the force required decreased with increasing AoA? Any studies ever done with the difficulty it would impose? I'm thinking Airbus where the pilot has no control force feedback.