I guess the takeaway is that everyday utility instruments should not require time invested in studying manuals to operate them. Imagine that every screwdriver you buy requires you to read 20 page document that tells you how to operate it. As a user all I want is "a cup of coffee". Why do I need to read that manual? What if I'm just a visitor, and was told that "the coffee machine is over there". Do I really want to read the manual to get a cup of coffee?