I'm not quite sure. There's multiple scenarios here. If we upload your consciousness into a computer and you're still alive, then there's multiple entities. If we replace your organs with machinery over time, then there is only a single entity that is changing. The latter is like the ship, but the former is not.
So by that reasoning, if we upload your consciousness into a computer and make sure we destroy you before we activate it, same difference right? We've just made the "slow replacement" process significantly more efficient.
I'm not sure if you're trolling, willfully missing the point to be contrarian (trolling), or just missing the point. Multiple entities makes a distinction in this thought experiment.
This is a really interesting point. From an economic perspective, I’ll say that if there are multiple entities, it dilutes the rarity of the original, and thus it is no longer the same. Destroying the original maintains the entity’s relationship to all external entities, preserving not only the original, but the original’s place in the system.