The main point of the guide is to steer people toward a working, shared understanding of how the site is organized, and how to decide where new stories should go within the site. We're really asking more of our readers than your typical weblog in trying to keep the quality filter high (which is why we chose scoop to begin with). So this guide is attempt to make it easier for more people to participate, and to head off potential conflicts about judging what should appear on the site and what's off topic.
My thoughts on this are informed by the success/failure of many sites out there, especially stuff like k5, which sets a standard we should shoot for imho. It's also informed by the many efforts to publish worthwhile content overlapping with our scope, including both formal and informal work (many of which are listed as recommended readings here. Hopefully /usr/lib/info will compliment those many excellent resources usefully.