Who isn't in the dark then? Front row'ers ref rugby games too, and from what i've seen they perform similarly at the scrum, if anything they are much quicker on the incorrect binding penalties due to their experience. But it is still a lottery when it comes to collapses.
That is why we need some sort of formula, or variable to keep an eye on when reffing. The only answer is intense data/video analysis, no doubt all the top level clubs and refs review every super15 scrum several times, and that has improved standards.