Google Now sounds interesting but when it comes to digital content apps (kindle, audible, etc), I don't see how shopping in your browser is even an inconvenienc

Google Now sounds interesting but when it comes to digital content apps (kindle, audible, etc), I don't see how shopping in your browser is even an inconvenience. If I bring up Siri and say "Google Game Of Thrones Kindle" I can have the book bought and on my screen with a few taps.