Wouldnt productivity have two knobs? Efficiency and energy/effort input?
Also efficiency sometimes goes against "right"? If you need resiliancy you then "right" migh include redundancy. In software, that could also be guardrails like memory safety that necissarily take some extra abstraction to implement and a processing penalty?
It has been almost a trope that every time the discussion of them buying up the used market and cutting them up to scan, some apologist comes along and says that these books are mass produced garbage and not rare.