That’s a great one. Better than what I used to say, which wasn’t even an analogy - that it’d be no different than a graphic designer supplying a hand-drawn/inked/painted sheet of paper, unscanned, for comping.
Love it, that's something everybody can understand. I might rephrase it as "doesn't know about sewing" though, as you don't need the practical skill itself but have to understand the limitations of different techniques.