Operational doesn't mean confidential. Sometimes reliability is the most important thing. For example sending a message to parents that school will be closed due to snow.
I just have a bone to pick with all this software using phone numbers as ID or notifications. Send an email where we can filter it or if you must, do an app with notifications I can tune to my liking.
SMS is almost always the one I see first, but they seem to use it as just one layer in a reliability sandwich.
Every once in a while, someone will send a text that takes multiple days to get to me, but that's about the only glitch I see.