Everyone in our family who sould have access to calendars/facetime/messages/etc. already does. It's overkill for just a smart speaker.
I guess maybe the kids who are too young to have their own device could more easily call their grandparents?
Cool hardware and a surprisingly affordable price, I just don't have a use case for it.
EDIT: The wall mounted version seems like a better form-factor though. Doesn't take up counter/table space at least.