Sundays were, by far, the least stressful. Although Congress had decreed in 1912 that post offices would be closed on Sundays, in 2013 the USPS and Amazon teamed up to have CCAs deliver packages to Prime customers on our one day off. We now spent that day making sure you got that thing you ordered that you absolutely needed to have delivered while you were sleeping in, at church, or at brunch. The facial expressions on folks surprised to see a mail truck on a Sunday were hilarious. I watched more than one person look at me, pull out his phone to check the date, and then quizzically look again, because, no, he wasn’t confused: It was Sunday. It’s less funny when you get your paper towels and dog food delivered on holidays; CCAs can’t take them off and don’t earn holiday pay.
You present a persuasive argument for the abandonment of the 5-paragraph essay and suggest a new format for presenting an argument... However, you did not provide much information on what is expected to go in between your introduction and conclusion? You suggested this format opens the essay to compare/contrast, cause/effect, analysis, etc... but how do you suggest students structure an essay with these approaches in practice? Any piece of writing needs some structure and main ideas that are then supported with various pieces of evidence (whether you are writing a historical thesis or a persuasive essay)... If you are abandoning a "main idea followed by supporting evidence" format, what do you propose should take its place? Or perhaps my understanding of the 5-paragraph essay you are speaking of is incorrect?
If you're a die-hard anti-book-marker, you may object that the margins, the space between the lines, and the end-papers don't give you room enough. All right. How about using a scratch pad slightly smaller than the page-size of the book -- so that the edges of the sheets won't protrude? Make your index, outlines and even your notes on the pad, and then insert these sheets permanently inside the front and back covers of the book.