I think that this is a point that should be made for anyone that needs to specify the registration policy. My feeling is that when the document is develop the focus is on the specified registry without looking at similar ones. Maybe the document should suggest that the IESG or document shepherd will try to verify that consistency was checked.
I'm very wary of suggesting that people copy registration policies from one registry to another. Mindless consistency between related registries in specifically a non-goal here: the important point is that the policy for each registry should be selected with though, and should apply to the needs of *that* registry, even if that makes related registries differ. I think the document is clear about that.
We get ourselves in trouble when a batch of registries are all given the same policy, and that policy turns out to be right for some and wrong for others.
Barry