OK, I take it you guys don't like the excerpt quoted from BFM. That's fine, be cool, relax, I'm not quoting it as if it were the Koran, but the perspective from BFM does echo some of the commentary in this thread, provides another perspective (a wrong one, as y'all have emphasized), and seems to echo rather closely what pack fitters at REI have told me (certain to invoke a fresh round of criticism of REI).
I can't tell if you're asking about BFM because you're curious, or just to rip it, but since you asked: it's a second edition 2005 book written by one Rick Curtis, "...director of the Outdoor Action Program at Princeton University, one of the largest and most successful college outdoor programs in the country. He lectures regularly on topics ranging from outdoor leadership to risk management. Rick has been backpacking around the world for more than twenty-five years." (From the back cover.) It's not a book exclusively about light or ultralight, but there are sections about light/UL woven in throughout. No 6-lb boots are recommended (where did you get that idea?); he recommends running shoes for 20-lb packs.
I'm not uncritical of the book myself--almost one half of it is devoted to wilderness medicine, and is prone to call for fantastical medical accoutrements that would never actually be carried unless you had a large group with one person's pack devoted to all things medical. And the section on Leave No Trace is insultingly paternal and stupefyingly pedantic, to the point I had to leave the book in the corner a few days before I could pick it up again. (I don't appreciate being lectured to, as if I'm a vandal.) I don't know if it's fair to judge the book's pack-fitting advice by the sections I didn't like, but the fitting information it contained is not rare or unusual--I've encountered similar at many other sources. Here at BPL is the first place I've encountered the "no wrap shoulders even on an internal frame" advice. I'm not arguing--I don't know enough to argue on this topic, or even have firm opinions. I'm merely an information sponge at this point. Mia Culpa, etc. I hope you guys know that I really do appreciate your advice and guidance, and I am paying close attention to it.
Mark, your quote on felt weight sounds like sage advice.