Re: Might want to check your facts...
My understanding, reading between the lines and knowing the APIs available, is that they’re both transmitting BLE messages and also registering to listen for them. You might know this as iBeacons.
You can listen for Beacons from your family in the background, the OS APIs make it easy and battery friendly.
You can’t transmit beacons in the background so easily, transmitting also requires more power.