Apparently Z Wave is releasing an update or module or something that will allow the Google Assistant (home) to directly control Z Wave Devices. Not sure, article seems to be written by someone who is unfamiliar with the current state of home automation. Not sure if this is basically a hub, or a update to hubs, or what.
https://www.cnet.com/news/google-home-expands-its-smart-home-reach-with-z-wave/