Replace "can accomplish the necessary task(s)" with "are functionally equivalent" and maybe you have a point.
But the pirate copy is missing automatic updates and access to the web services (which Adobe has cleverly started moving into to add value where pirate copies cannot).
Not really, lots of things can accomplish the same tasks and are functionally different. A car will get you from one location to another (necessary task), but so will a boat or a plane.
