Based on my thread linked below I believe it would be beneficial to have a notification/subscription center that lists all the notifications you are actively subscribed to with the option to turn them off and on.
It would also be beneficial to have descriptions of what each actually does so it's clear what you are turning on and off.
Some nice to haves:
Option to text notify, possibly even on specific flows for when they fail
A way to pause the emails of a failing flow for a period of time in the event of a service outage to stop notification spam
Extend this to other products as well, PowerApps and PowerBi specifically.