I went to an engineering school (the Naval Academy) where I was a history major (36 hours) with LOTS of engineering, math, and science hours (88 total). The Engineers always used to call us "bull majors". Well in this case, I know enough about bull AND graphs to see who is REALLY slinging some bull.
"If you can't dazzle them with data, baffle 'em with BULL!"
However, I DO appreciate the thought that goes into this. It DOES "sort of" quantify the otherwise intangible aspects of lightweight backpacking. However, the graph doesn't specify the perfect "sweet spot". Therefore I figure I should simply add gradations to the x- and y-axes that specify MY most common load weights as OPTIMAL! Peak Bull achieved! ;-)