It's got to be bands causing these issues for most people (except space gray/space black, maybe).
You may be right about the bands. I noticed this rather graphic account of the black bands peeling:
https://forums.macrumors.com/threads/1872568/
So if the band shown in post #8 is typical of the black band quality, you can see why they might have stopped production of black bands until they figure out the cause.
I'll bet Apple are pissed if sales of their hot new $600 "luxury" item are being snookered by a $2 rubber band.