I think the best use cases for voice assistants are when you don’t have free hands. I have two scenarios where I use voice assistants: setting a timer while cooking and changing the music while showering. Both could be done by other means as well but they wouldn‘t be more convenient.
Exactly. For instance, in the mornings Google Assistant has been really useful for when I say "OK Google, Good Morning". It then runs through and tells me:
* Current time, and weather forecast for the day
* Upcoming meetings today
* My current commute time to work, including traffic
* NPR news podcast
So during my routine of letting the dogs out, starting the coffee, etc. in the morning, I get the daily "essential" info.