THE SHIP OF A MILLION YEARS
He’s got a point… the Thesean dilemma is true of all things that maintain at least some sense of their (original) integrity, even men.
But this gives me an idea for a science-fiction short story. About a ship whose components are gradually and intentionally replaced over time by new components of the exact same shape, design, and dimensions but with vastly different and more complex capabilities.
Adaptive pre-programmed (improvable future) design is one of the basic core principles of my personal method of design and invention.