My point here with my Droids, I can make the light blink a certain color for various events. Therefore, I don't need to turn the screen on for some colors, but I do for others. It's something simple that's highly useful.
I guess I choose to have my phone notify me of things I want it to, instead of having an LED flash to let me know I have a notification. Seems a little redundant in my mind, but to each their own yo.