I think it is absurd that there is no notification LED. Just like I think it is absurd that you cannot toggle sound AND vibrate off from the volume rocker shortcut.
The normal feature to have would be to have the phone completely silent at night and then find a blinking light on it in the morning. On my ancient HTC I had blue for new text messages and green or orange for other things. Simple. And voluntary to use if one prefers a LEDless experience.