This is the link you are talking about, I think: http://news.ycombinator.com/item?id=1840896

Edit: responding to your edit.

I think you're right that the guide would miss a piece of wisdom like that if it tried to teach in a normal top down way. Some kind of Q&A subsection may need to exist, and it may be a good source of inspiration for new lessons or case-studies that should be published.