If they had increased the density then it would not bend, it would likely snap/shatter.
I would imagine it is still made out of the same material it was before, thus by making it thinner you make it cheaper. And unless good scientific evidence comes about that it is different then I will still feel the same.
Which of course would be all well and good had Intel fessed up beforehand and been honest about it (see also, GTX 970) but instead they will probably leave it for a while to fester, then come out with some lame crap excuse saying how they only did it to make things better for their customers (see also, GTX 970). And people will likely swallow it and lie down (see also, GTX 970).