Having used phones with an LED, I have embraced the concept... big time.
Green=WhatsApp/Social media
Purple = Important eMail
Cyan = informational eMail
Yellow = less important eMail
Blue = Calendar Notification
White = Txt
Red =Low battery/Missed call
Given the above, you're probably not surprised, that social, txt and email messages have there own audible notification with accompanying spoken identification. i.e. "bing bong, you have email from Slow Loris"
My Lumia 520 seems to die a lot as there is no flashing red low battery LED to prompt recharging.
For me, Microsoft has negated one level of notification and I bet they weren't eating Christmas cake with extra marzipan and icing, which meant going off washing your hands coming back checking the phone... no, no txt, then having more Christmas cake.. while the obnoxious Android guy with his LED notification phone, just sat there stuffing his face with Christmas cake and didn't even have to check his phone and was already on his next piece of Christmas cake when you got back from washing your hands.
I just think if you're not getting txt/social media/emails every hour, all the time, then having to "glance" at a phone to check you don't have a message could become tiresome or just missing that moment cause you popped outside to feed the cat and didn't hear the audible tone.
All that said, we had to link txt message alerts to a standard landline phone(PanasonicKX-TG7873) or my mother would only respond the next day to a txt messages and she has a phone with a "flashing LED" ... old people, what are they like.
So, in summary, I'd like Microsoft Phone people, cause I know they always have clean hands.
Android LED phone people, I wouldn't be so sure about.
Update - Oh and here's an interesting one, we have WhatsApp groups with audible notification off for one year and LED on.
These are throw away conversations, that most of the group at any given time are not interested in and don't want audible notification bothering them. so over an hour, one follows the conversation by watching for an LED notification if participating.
Or if you're on a Windows phone...Glance..glance..glance...glance...clean hands... glance.. glance... read sarky comment about you being on a Windows phone and not glancing for 30 minutes. .. Then making a glib comment about LEDs ... and then leave that WhatsApp group. Problem sorted.
Or maybe enable audible notification on a throw away WhatsApp conversation group... then three hours later realise it will drive you insane and leave the group again... and just roll your eyes when LED notification is mentioned.