And if anyone had said the Kindle was better, this snark would be relevant. But this is clearly a discussion of tablets' weight and whether the iPad Air's weight is a significant advance.
Think about this: if the Honda Civic was upgraded to be able to do everything my SUV can, including towing, off-roading, cargo capacity, and overall comfort, but its size AND price stayed the same, would that not be considered revolutionary?
Signed, Physics pedant.