They just need to get rid of that big sheet above the lumbar pad with "FLOW" arrows that, errrr, impedes airflow for not much gain and it would be lighter still, and I'd guess more comfortable too.
If you've got the weight taken at the hips there is nothing for a back pad to do except add weight, cost, and impede ventilation. (Oh, and look a bit more luxurious on the shelf and in pictures, of course). Fair enough if you'll wrap the belt backwards to get a bit more climbing movement, but not many people climb pitches in load-luggers like this... looks like the usual story of do something really good and then have the marketing people bugger it up with unnecessary padding. Grrrr.
Pete.