Every actually had a phone with a notification light? It's so convenient, I can hop out of the shower and glance at the phone while it's off, if the light is flashing I check it, if not then there's no need to even look at it. Since switching to the iPhone I find myself having to turn the screen on multiple times a day to see if I have any messages. I always have the phone on vibrate as a courtesy to others since ringtones are annoying and rude while in public settings.
The vibrate feature isn't quite powerful enough that I can always feel it if I'm walking around. Would be nice to pull the phone out of my pocket, see if the light is blinking or not and put it back in my pocket. Would sure save battery life not having to power on the screen multiple times a day.
You think a constantly blinking light would save battery life over a screen turned on for literally 1 second? I'd like to see your data on that.