BSMs can perfectly used for services like statuspage.io to present customers your system health or for emergency service calls.
All the worse that BSM alarms don't provide enough information about the outage (see attachment).
I don't like the fact, that I have to search for other alarms to figure out which one caused the BSM outage. Also alarms can be cleared automatically so you don't find something in the alarm page and you have to search for resolved outages.
Feel free to add other ideas.