Call me superstitious, but I believe that teleporting machines are just copying machines. The you a t the destination is just a copy. The you at the departure is just thrown into the supply hopper to build the next arrival.
Is that meaningfully different from what happens to you now, instant-to-instant? How many of your atoms need to be swapped out for the copy to stop being "you"?
So? What does "just a copy" mean? If it's an exact copy, how do you tell the difference? Why can't there be two you?
...and the recycling disassembly is unspeakably painful, but that's OK, because the destination you is a copy from before the pain.