I guess it is a good idea, it helps the notification feel like part of the app is running on your screen in that little dot, and you're just expanding it by tapping it, vs notifications feeling like hyperlink shortcuts to the app. I still can't help but think that the "Dynamic Island" will suddenly disappear like Atlantis the moment Apple invents a good solution to put cameras under the display. There's no cameras on the long edge of the display, so dynamic island doesn't really work in landscape mode and hide the cameras at the same time.