Why do flaps, ailerons, airbrakes, rudder and elevator work on fully turned off aircrafts?

1st Official Post

    Despite quite well-done Airbus 319/320/321, I`ve noticed that aircrafts such as A380 and B737/747/777/787 have some common problem - all their moving surfaces (flaps, ailerons, airbrakes, rudder and elevator) can be used even if the aircraft`s hydraulic system (or the aircraft itself) is fully tuned off - so the flaps can be released and retracted and all other aerodynamic surfaced can be easily controlled. While having nicely detailed A320 family planes, I really don`t understand how could this happen to other aircrafts?

    Quote from Hamza_i_07

    I think it’s just a matter of some internal systems being fixed, since Boeing and airbus have different operating systems redundant on each other. With the team being all hands on deck with the a350 I think they will look into these fixes further into the new year.

    This problem really bothers me, because all these planes were released separately and I don`t think that they all have been released in a hurry. Also the logic is quite simple: aircraft is off -> so all the moving surfaces are unavailable. I think even if the developers don`t have an actual detailed information about hydraulic system of the aircraft, it can be simplified for the time until they get that amount of information they need. However, I really believe in developers professionalism, as they were able to create A320, so, yeah, time will show.