Agreed, but also: Drawing is an art, but art is more a technical skill than people give it credit.
"What to draw, how a viewer should feel" is the job of a marketing department.
Artists work technically, putting world into medium, exactly as what this guide instructs one to do. By way of harboring the relationships, possibilities come to mind and creativity ensues. Never let them tell you otherwise.
I love everything about this post; I only think it owes more credit to itself.