Cars have power steering, where it's pretty much impossible for steering to require superhuman effort. Why can't the hydraulic assist of a plane be designed the same way?
[1] http://aerossurance.com/wp-content/uploads/2015/03/737-contr...
Elevator upwards deflection loads the tailplane aerodynamically in such a way that it becomes harder to trim the tailplane in the required direction.
so I'm not sure what you mean by "matter of aerodynamics", because that comment suggests that it only gets harder due to the forces exerted by the air on the control surfaces, and so could be overcome by applying more force --- which a hydraulic system could be engineered to do.