I have a lot of automations tied up to if I’m home or not. At the moment this requires me to always have my phone on me. However, now that I have a cellular watch I want to be able to leave the house without my phone and have all these automations still work.
You can do this through integrations like MQTT Room and ESPresense.
Edit: I should clarify, ESPresense is a community add-on
good point, and I’m looking into this, this would solve some issues, but others (like keeping track of where family members are on a map) would not be. This also requires me to setup something to track bluetooth devices within my entire house, which is extra work and expense