When my phone beeps/vibrates once, that sometimes isn't enough. I may be in a meeting and think I'll look at that later but later I forget. Or I may have temporarily set my phone down and it won't beep again when I pick it up later.
In the mobile notification action, I would like an option for "Once" or "Repeat Until Acknowledged". Once would be the default. The "Repeat Until Acknowledged" notification would keep sending me notifications ever couple minutes until I tap on the notification. Tapping the notification launches flow, confirming that I have received the notification, and stops sending me further notifications.
The above would satisfy my use case. If you want to be more general and fancy, you could have an option for a notification to pop up choices for the user. For example, "X has occurred. Do you want to Y or Z?" In this case, Y or Z would be buttons. In the flow it would have a branch like the Condition with options for Y, Z, and No Response. This would enable creating flows with notifications that present branching choices to the user. This more general solution would enable me to implement the Repeat Until Acknowledged feature myself by creating buttons such as Snooze and Turn Off Alarm.