Actually, in a scientific context, it's mainly taking away reflections, not light as a whole. It theoretically should only filter lightwaves oscillating in the same orientation, which come naturally from reflections but not from light sources themselves.
That would mean specular reflections like high gloss should be gone but not 3D effects such as gradients, indents and shadows.
But guess what? Apple has already started doing that in iOS 6:
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I could also start comparing older app icons with newer ones (Apple Maps, Passbook, Game Center, Find my Friends) to show gloss is going away but I think we all get the point.
iOS 7 is likely only going to continue in that direction and de-gloss the remaining glossy items such as contextual buttons, some navigation tabs, Messages bubbles, older icons, etc.
I'm not sure why it would suddenly be a big deal when the gradual deglossification is nothing new.
I'm guessing "polarizing", in that context, rather meant that people will either love it or hate it, implying that there will be some serious change.
And thank you for some actual logic.