I don't know about google home, but with Alexa they had advertisements with Alec Baldwin (before the incident) buying socks using Alexa. It probably made a lot of sense to someone like Jeff Bezos because money is nothing to him. So just saying "Alexa order me some socks" without even looking at a price makes a lot of sense to a billionaire.

But yeah... for everyone else it's just a "remind me in half an hour to check on the roast" kind of device. I think it's kinda funny they invested a lot of money into developing devices that are only slightly more convenient than setting an egg timer.