The biggest concern in these environments isn't information reaching the people inside - it's those people extricating that information (intentionally or otherw

The biggest concern in these environments isn't information reaching the people inside - it's those people extricating that information (intentionally or otherwise). So having a system where e.g. some scientist's family can tell them they need to call right away is super helpful and not a huge security risk because they have to go through the process of leaving before they can actually contact them. There's no [obvious] way to MITM the pager and get it to extricate any data.