A hand on RoboCop is more doomed than a Hand in King's Landing. Unless it came from Chow Yun-Fat, it can't be as accurate as a machine, and it can't come from Chow Yun-Fat because he'll never die in the line of duty. Worse, turning his primary weapon holder into a weak point means that the only action hero who can actually survive concentrated machine gun fire still needs enemies stupid enough to miss at point-blank range.
People made jokes about shooting the original RoboCop in the face, but when he removes his helmet, you can see that they've replaced his entire skull with metal and hardened plastic, pinning his face back over it. (This is also implied in the scene where they screw down the LED display behind his eyes before he wears a helmet.) They're not going to replace only the back of his skull. That would be a titanium ice-cream scoop holding his brains as a weak point.
Baskin Robbins' new "faceful of tortured loss" flavor proved unpopular and expensive.
The symbolism of a human hand pulling the trigger for a robotic drone (after being killed by a terrorist-style car bomb) is painfully obvious, but not as painful as that hand getting shredded by machine gun fire. RoboCop's human hand is even more vulnerable than a regular cop's human hand because most human torsos don't create ricochets. The symbolism is also destroyed when they show him firing from his artificial hand anyway.
I'm all for new themes. It's 20 years later, the movie should be about something else. RoboCop is the perfect vehicle to explore the morality of drone pilots, literally turning the pilot into something less than human in order to make him better at killing on command. It reduces the person to just another expendable, mass-produced link in the chain, distancing those who order the deaths from their actions.
If I thought the new movie were capable of subtlety, I'd think they were deliberately taking the piss out of the original. The right hand is the first thing Alex Murphy loses when he's shotgun-crucified by Clarence Boddicker, and his resulting right robo-hand has a data spike that's essential to every pivotal scene in the movie: recognizing his own murderers, defeating Boddicker, even facing down the final villain in the OCP boardroom.