I thought that was one of the most obvious parts of the movie. I didn't hate it, but it wasn't like an OMG reveal for me. My favourite parts were the testing of what it means to be human. Everytime I settled on easy criteria for what is human then the movie crushes those assumptions. For example it's easy to say that the death of Joy, who was programmed to love him and had no physical body, was a real loss of some kind. But, to what degree - if we say she was nothing more than an advanced doll, like losing a save game, then the same could be said for the replicants themselves; programmed for obedience. Does having a body make the replicants more human than Joy? Does having more sophisticated programming make the replicants more human than Joy? Did the replicants really have that much more free will than Joy? Do human really have that much more free will than replicants? To me, the line the really disturbed me the most was when the main character asked Deckard about the dog. Is that dog real? and Deckard says"Why don't you ask him?". Stunning.