I am somewhat surprised based on my experience with Google Home in multiple rooms of my house so far. Personally, I couldn't be happier about taking the plunge and get (increasing) value from it after months of use.
But frankly I think there is low general awareness about these voice assistants(' capabilities). I do not know any non-tech types who own Google Home or Amazon Echo yet -- but think this is true even for most who own them like the article points out. Generally expectations seem low and complacency high about what should be possible beyond mobile. (i.e. Hmmm, what would I use that for?) And low market penetration means we have not seeded enough techie cross-pollination and viral conversations between non-tech types to increase the broader interest and sense of possibilities.
Use cases for voice assistants are limited of course, but the use cases are great fits for a VUI and bad fits for a mobile device (and absolutely terrible for a desktop or laptop) by comparison. That is the point.
Asking Google Home to tell me what to expect weather- or traffic-wise, play music, put something on my shopping list, catch me up on the news, turn down my thermostat etcetera while I am readying my kids' lunches, cooking dinner, <cough>in the bathroom</cough>, changing a diaper, or busy with countless other things is ~huge~. Who the heck wants to needlessly grab/find their phone or tablet or walk through their house or make a mental note to do so once they get a chance? Who wants to unlock a mobile device? Who wants to clean and/or dry their hands first when appropriate? Who wants to tap through screens to do what a simple, natural request can accomplish? There are oodles of common, frequent scenarios where fumbling with a mobile device is horrid compared to the UX that a voice assistant provides; and we (I personally too) have just scratched the surface of what's possible -- with current offerings and with what I believe will follow.
I further gained an instant multi-room audio solution with Google Home that is great for me. As a long-time Google Play Music/Spotify/Pandora and Chromecast user who wanted multi-room, wireless audio without sacrificing 30 goats to Sonos, Bose et al, this was a no-brainer; and I can easily expand and/or increase the volume and fidelity of my solution with Chromecast devices and almost any other gear I want (or already have).
Although I think the above points alone make a strong case for Google Home or Amazon Echo, it is quite clear I will get even more out of my investment by a) making it a habit to steadily identify new use cases that make sense for me and learn how to solve them with a voice assistant and 2) link it to my home automation more. This is part of high expectations and low complacency about what should be possible beyond mobile; it doesn't just happen automatically; but maybe the average buyers of these first-wave assistants didn't expect to put any work into how to best leverage them.