When the first iPad came out, people marveled at how Apple could pack so much into something so thin and light, and yet the iPod Touch at the time had the exact same technology guts and was significantly smaller and thinner then the iPad, which continued right up to the current generation of the iPod Touch. All the iPad had was a lot of extra room for more battery.
Today, iPhone 5s must be a distant memory because it has the same technology AND includes the touch ID, and even the new iPad Mini has the exact same technology as the Air, its the same thickness and is much lighter.
I.e. the iPad Air was trivial to engineer because its just a larger case to hold the iPhone 5s guts.
I'm amazed at how people gush over something new and shiny from Apple without realizing that there is nothing really impressive about it.
Are you serious about the iPod touch and iPad comparison? Dont you think it would take more power to power up a 10" screen? And won't the bezel and back plate for a device with a bigger screen also be bigger and heavier. Not to mention the structural integrity would require slightly thicker material. The CPU or guts are actually not really significant in terms of the dimensions of the tablet. The retina mini also had to get thicker and heavier due to the retina display.
Or do you think a minivan should weight the same as a compact couple because they have the same engine?