Now that iCloud Messages can be sync'd to iCloud, it would be great if Notifications across the board could be sync'd there too - make this an across the board option across all apps, not leaving it to apps to implement their own solution (some 3rd party apps do this now). It would be nice to see that if a notification is dismissed on one device it is dismissed everywhere. This will make more sense once Mac OS 12 is out and notifications can be grouped - then, I could easily dismiss for example all the CNN notifications at once.