DeletedUser396 My locked rebooted BFU phone rang.
Something to consider would be using encrypted communication apps like Signal, XMPP, Matrix, SimpleX, etc. After a reboot, those are unresponsive, sometimes even until you open the app. So for someone whose primary communications are encrypted, this is a concern.
I do wish this wasn't a problem. I know I wouldn't be able to see any details or respond before unlocking, but I have to be considerate of when my phone reboots. I still have it reboot every 4 hours, and would do more if possiblle, but just today I didn't get notified of an emergency until over 4 hours later because my phone wasn't AFU. Thankfully it wasn't imperative I do something, but you see the trouble.