Fun fact: Vision has discussed the Ship of Theseus with himself before. In issue 6 of the 2016 Avengers comic written by
@MarkWaid and illustrated by Mike Del Mundo, a future Vision gets philosophical with his present self.
"The Ship of Theseus is an artifact in a museum. Over time, its planks of wood rot and are replaced with new planks. When no original plank remains, is it still the Ship of Theseus? Secondly, if those removed planks are restored and reassembled, free of the rot, is that the Ship of Theseus?"