There’s an interesting recent post at twocanoes on how beacons can be used to detect which room a person is in, to then run the correct AR interaction:
“While ARKit is aware of the geometry of the room the phone is in, it doesn’t know what room it is in”
Beacons solve this problem. In fact, beacons are a useful addition to many apps. The more interesting usecases are often an ancillary use rather than the main use of an app or service.