I'll speak from my experience in the ombudsman field for the last 20 or so years. I've worked at three different ombudsman offices. I've overseen and been involved with complaints about multiple organizations.
Organizations tend to not be very good at being self-reflective. They tend to get entrenched in their process and their policies, and they don't have the ability to look at it from that independent ombud's perspective: Why did you do something in this way? Why do you do this that way? Maybe there's a better way of doing it.
That is why I think the independence and that fresh perspective that you'll get from an external organization coming in to take a look would be very helpful, and I'm not speaking about just the organizations and the sectors here. I would say that's the case for almost any large organization where you have lots of policies and you're dealing with the public. It's very beneficial to have that independent oversight.