Exactly. I don't always keep my phone in front of me. Especially evenings I keep it on a shelf or bookcase etc. inaudible. And especially when the lights are dimmed I can immediately notice when my N8 has had messages for example when the notification led glows. Yes it's a very specific situation, but even when I have direct view on the device I don't specifically have to look at it when the led pulsates to see something has happened.