It was not just accuracy, it was also vitality.
Back when tanks could use dps accessories, and those had no vit on them, you had to figure out how much health you needed (or how little you could get away with) for a fight to comfortably do your main job, not dying to tank mechanics, while putting as much into more damage as possible.
It wasn't super interesting either, but it added a few more considerations to "stack as much crit as possible".
