I've got one main question: If clinging is truly gone, where is there room for negative mental gunk to arise at all anymore? It's true that we've habitually conditioned ourselves to have those negative reactions, but in my understanding of the dhamma, we are not only to dis-identify with our mental conditioning, but to overcome it.
The way I see it, if there is no ignorance of impermanence, there would not be self-identification, clinging, or aversion. Without these things, how can the old habitual reactions keep arising? The root of them has been cut.
What you have described in that post, I think, is not at all an unimportant realization, but I do think that it is only an intermediate one. I think that the fact that self-identification, craving, and aversion still arise in the individual, even if only very subtly, is a sign that they have in fact not finished the path. That they are seen for what they are and understood is definitely a good thing. But I don't think it's the end.
At least, I'd like something better, myself.