Plain and simple, battery is shaved so much that there is no surplus left (in the name of thinness), nothing to amortize normal battery degradation, so iPhone only works beautifully during initial review and couple of months after that.
I really love Apple and some of my daily living depends on it, but this crap has to stop already. Three years back until now there are many missteps in the name of fad and profit, couple of years more and it won't matter since I won't have any market in that ecosystem.