I have two McHales, and for almost every 3 season trip I take with them my base weight is under 10 lbs, which the pundits here say is UL. So these MUST be UL packs. Which, I suppose, is Dan's "rant" about really light packs.
If you can't backpack within the BPL definition of UL with a 4 or 5 lb pack, and you think UL is Nirvana, maybe there are other gear items you need to pare down, or even leave at home. The good thing about my packs is that I can easily carry 10-14 days of food and copious amounts of water. Plus I don't need to worry about a pack failure on the trail. It works for me. YMMV.
I am sure that Dan can, should he want to, build really light packs. But there are reasons (I can guess why -- but don't want speak for him) he chooses not to.
Again, we are debating gear ad-nauseum here instead of focusing on our hobby, which is to get outdoors and hike.