Wouldn't it need you to buy compatible devices for the home automation to work (If yes, the phone would do that as well - there are 'app' controlled lights/other fixtures).

And Google Now does do one command music streaming (I do that everyday - "Ok Google, Play Music" - and it starts playing). Audible and Reordering past Amazon orders - Some people may find value in that. I don't listen to audio books or reorder stuff in general from them.