I love home automation but unfortunately can't think of any beneficial use-cases. This would require each person being tracked to have an android based device

I love home automation but unfortunately can't think of any beneficial use-cases. This would require each person being tracked to have an android based device with wifi enabled and the app running. I can't track my children, I can't track my wife's iPhone. I couldn't even track myself if I left my phone in the charger. It would be neat to track my positioning and run some statistics but I wouldn't say it's useful.