The only reason every (yes every) airline operator in Australia has gone down the FRMS path is because they see it as another opportunity for greater "productivity".
The BS and smoke and mirrors of scientific based limits is just that! I had a discussion once with a manager who had been put in charge of his company's FRMS program. I'm sure his babbling about the bio mathematical model gave him some sense of personal intellect, but the reality is, it's all just a con!