If someone concludes that it’s fine for them to eat cows because cows never invented computers, then there’s not really much of an argument against aliens turning us into meat slurry because they have the 4-chambered quantum brains needed to invent hyperdrive and we don’t, is there?
I don’t even go into the “it’s fake” argument which tends to go into very dehumanizing ideas, like people now that have prosthetic limbs are somehow “less human” and the like.
That said, I also argue that “that perfect copy is literally the original and if you disagree you are a mystic hippie that believes in souls and fairy dust” arguments also dehumanize people by way of suggesting that your existence, right now, is that disposably interchangable and a widget made at any point in the future (or a billion widgets) not only replace you but also effectively render your original self invalid in favor of the new “originals.” I feel like it’s primarily death-cheating
fantasies from people that are (understandably, I admit) afraid of death and want to believe that pressing a button will bring their subjectively experienced current selves back from the dead.
I mean that’s exactly what happened with Raymond Kurzweil. His dad died, he really didn’t handle grieving that well, and wouldn’t settle for anything less than Singularity™ computer magic undoing that loss. It’s a grand heaven promise, a religious one, but with the trappings of secular scientism all over it.