Concept art can vastly change the direction of a movie, with some designs serving the underrated role of mooting particular avenues for the movie to take.
It is fully encased in material, where the mechanisms of Pierce’s prosthetic in Logan are exposed.
As Guraziu himself says, the look of the prosthetics that made it into the movie are much more fitting.
The bionic hand is noticeably different to the skeletal prosthetic of the movie’s chief villain, Donald Pierce, which looks more retrofitted than something that has been purpose-printed for the job at hand.