I recently had a case where I wanted to see the "In use by" of a large number of devices (I was moving from devices brought in from HADB to the new local Ecobee integration [RELEASE] *any* hub (C5/C7/C8) Ecobee No Cloud HAP Thermostat (Local) — direct control of an Ecobee thermostat, no Apple hardware).
I wish there was a single display of "In use by" for all devices.