Theseus's ship misses the most important question, which is how do you rebuild a ship? People take it for granted that a ship can even be rebuilt.
Discussion
Especially if the ship is in motion.
First, understand there is no ship
most definitely, it is hard for most to see they are even on a “ship” so when discussing upgrading the ship the design trade off discussions tend to befuddle people… which is it why it definitionally takes time … which is why it is definitively hard to choose the moment the upgrade crossed the chasm/reached escape velocity