Anything that is proven is better than something unproven - regardless of weight. There are lots of other places to cut weight, and no lack of proven packs. A pack is the last place that I personally am interested in cutting weight.
This KUIU pack frame is a very radical design that does indeed look quite refined. Because it is a radical design, it has more to prove than a pack composed of more traditional proven features. I think that's where the critique is coming from. Once this thing has proven itself in the market, it may indeed be without peer.
