I have z flip 5 and would especially enjoy this feature there. I miss the old blinking led when there was a waiting notification from a certain app on older generation models. I like Edge Lighting but it's really just more pleasing than functional since it only works when you already have your screen on. Idk, I think applying it to/over the AOD would look amazing and provide more function to it.
There is the AODnotify app, which I use to recreate the old notification LED. It's worked very well on the five Samsung phones I've had in the last few years.
