Home Key is one entry method
Compare keypad, fingerprint, app, NFC, physical key, and emergency power alongside it.
Check the Apple home hub path
Remote access and automations can require supported home-hub hardware.
Wi-Fi and Thread create different battery tradeoffs
Network design affects hubs, response, and power routine.
Plan every resident's fallback
Not everyone will use the same phone or wearable, and devices can be lost or discharged.