"Treat production as harder than design When asked what single engineering problem consumes most of his time on Starship, Musk answered not with a design challenge but a manufacturing one — engine production. He stated plainly: 'prototypes are easy, production is hard,' and followed that taking an advanced technology product into volume manufacturing is 'orders of magnitude' harder than designing it in the first place. This reframes where ambitious builders should invest their energy: solving production before declaring a product viable. Source: Elon Musk, Lex Fridman Podcast, Elon Musk"