It depends on what you define impairment to be. Just like a bipolar person in mania, when they are not manic, they are still bipolar. That won't go away. I personally, having been one of those LBSs who had a crisis of sorts, am not the same as I was before, nor the same as I was in crisis. Crisis was an extreme change. But I take a lot of hormone-balancing supplements now. When I do not take them, I can easily spiral into a mess. It would take very little self-neglect, honestly, to tip me back in. I know that, so I have to stay on top of it. I have to stave off depression by being conscious and mindful of my thoughts and nutrition. These are all things I now know have been lifelong problems that had escalated to a huge extent in crisis. And the consciousness I have now to deal with them IS reflective of the maturation, the mirror work, the rock bottom bounce. But there are still things I'm sure I will deal with forever, and though a lot of my interests are the same as when I was younger, my skin and health aren't as ragged as they were in crisis, I have balance and peace - but I'm not the same. I can in some ways say I "came back" to myself, but in other ways, it was just "moving forward" out of the depression, not really a return. I'm sorry if that sounds contradictory, but if we're having a real discussion about this, I think we need to look at the gray areas and not just the black and white dismissive ones.
Me, kikki, Anjae, and several others spent a lot of time researching and sharing things here, and I think it was a huge part of our process. There's really nothing wrong with exploring these concepts. Even the ones we've already been over, and especially the new things! Are we likely to hit the nail on the head as to what caused this for everyone? Of course not. But this is part of our fellowship, and how we're building relationships with each other, if nothing else, based on the areas that most intrigue us about this fascinating and awful (lol) time in our lives.