> MacBook hard drives can be removed and replaced.
This is not entirely true. The flash drive on the 2015 and 2016 Retina MacBooks are "soldered to the logic board" according to iFixit [1], [2]. What happens to the soldered-in flash drives if a logic board from one of these MacBooks fails and is swapped out by Apple under, say, AppleCare? is it desoldered and removed from the logic board, or does the entire MacBook logic board get shredded in one fell swoop?