Although the target customers are not the same (... yes I know), there are ppl willing to sacrifice the 36-70mm and F2.8 to get a less heavy 'kit' lens (with the gain of 16-23mm and VR). Indeed, I'm one of them
All-in-all, weight is inevitably a matter of concern.
ps. N24-85 VR was not yet released when I bought the 16-35 F4 VR