Google has analyzed how people are using tablets and what they are using them for, and easily the least surprising but most trumpeted fact is that people use their tablets rather than booting up a computer (ditto here). Uhhhhh. Really? Do any of these people own a tablet? Once you own any tablet, any of them, using a laptop or desktop computer is like moving from fiber-optic Internet back to dial-up. Computers have to boot up. You wait and wait and wait, sometimes for a whole 60 seconds (!!!), while the tablet — like your phone — is on instantly, but unlike your phone the screen is large enough to let you actually SEE things.
Tablets are not more useful overall than laptops or computers, but for the simple stuff you want to do to fill your time, it is utterly unsurprising that people refuse to boot up rather than simply grab a tablet.