My father was in the hospital recovering from a heart attack. We were staying with him in shifts, and when I was "off", I watched the last episode of succession. I made sure my phone was on the chair next to me and the notification / volume was all the way up.

After the episode he was dead and I missed the whole thing b/c somewhere along the way "press volume button at home screen until it was full" did not actually turn notifications on anymore. I've never been so mad at UI/UX.

Turning on ringer / notification volume requires pressing volume button once, then clicking the equalizer, then dragging the notification volume up to desired level. There's no indication anywhere that notifications are silenced. I have a google pixel 4.