Because it's not being applied consistently.
Until they sort that out it's not worth bringing it in.
Of course it is. It's missed things, but even factoring in that, its probably got 75% of decisions correct over the existing inept/corrupt system. That's a vast improvement.... not perfect, but you'd have to be mental to not take a 75% improvement over the existing system at the starting point, to remain with the disgrace of the existing system....