In The Empire Strikes Back, Luke's robotic hand is given realistic skin coverings, and we are pointedly shown that Luke has feeling in the hand, so that we are not unsettled when he puts his arm around Leia.
In Attack of the Clones, Lucas does not give Anakin's hand skin coverings, and he does not indicate to the audience that it possesses feeling. In this case, he wants the audience to feel somewhat unsettled. The ending of Attack of the Clones is more ambivalent. This is a doomed marriage.