> I realized you can't truly turn them off on FB messenger. You can only mute them for up to 24 hours.
At least on iOS, you can go into the system settings, scroll down to the Messenger app, and untoggle "Allow Notifications".
It's having to go around Messenger, and doesn't disprove your point at all. But I ran into the same realization you had, but couldn't easily stop using it completely as Messenger video calls are really important to my grandparents. So I just disabled Notifications at a system level, and open it up periodically to check new messages (same as you mentioned for email/text).