Not to do so would be like "a printer trying to write his own books": on the one hand there is enormous scope for development and improvement in printing technology (the manufacture of IC wafers), but on the other, if one also has to concern oneself with the content of what is being printed (the circuit design of every chip), one is almost sure to overreach oneself.
就像「搞印刷的兼寫書」，一方面印刷技術（IC 晶圓的製造）就有無窮的研發改進空間，另方面卻還要顧及印刷品的內容（晶片的電路設計），難免瞻前顧後、力不從心。