haha, no it's just often the best way to get even general and mundane announcement and info out to everyone - and stops people complaining that they aren't in the know regarding dates for CO visits, assemblys, congregation get-togethers, cleaning, gardening etc etc.
And obviously is also great for unforseen emergencies etc
https://www.theguardian.com/us-news/shortcuts/2016/sep/20/new-york-bombings-wireless-emergency-alerts
And anyway be honest, if there's an emergency, who wants to spend a couple of hours on the phone telephoning people - 2 minutes to send out a group text to everyone - job done