Well in my situation it takes my body a while to get used to not having the carbs that it usually has. So on a CKD I am ok after a few days without carbs, and by day 7 the refeed doesnt really effect me because of the massive glycogen surge.
Now if i was to suddenly go from my regular diet, to no carbs, low carb, high carb, my body just wont adjust quickly enough, and I will end up being moody and possibly violent. Its just how I am, and after long period of that, I would end up depressed, and eventually single hahaha.
I just know my body, and I know that its not good for me mentally. As for fat loss, I have no doubt in my mind that it works just fine, but the detriment is too much for me.