Coming from a Motorola device with Moto Display, I think an LED notification light would still be nice. With an app light Light Flow, you can assign and customize the color to just about any app, which is great if you're on the other side of a room you can tell what notifications you have. Always on display is nice, but you can only see that from so far away. I would use both if the option were available. The idea of a light on the back of the device is a good one, LG actually did that with the G2 if I remember right, they had a colored LED on the front and light around the power button on the back.