you're viewing the drawing as a product, analogously to a computer program, where I don't:
As a one-time indentured draughtsman and qualified Mech.Eng, I can tell you that your interpretation is discordant with the way engineers view blueprints. Each blueprint has its own document no.; modifications history; title; keys; etc. They are "documents" in their own right. And in combination with materials lists--which sometimes are included on the drawings, they can be a complete specification for the manufacture of the product.
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.