It's like they choose these LEDs to be visible in sunlight like everyone uses these outdoors or right next to a window that has sunlight coming in. I don't mind a little blue LED or any other color LED just choose one with a low enough lumens, wattage, whatever value you specify by so that it isn't intrusive in a moderately lit room.
And that's what I was referring to with "low-intensity LEDs". Layman definition: won't blind you (see any D-Link DIR-825 for reference) or distract you.
I mind blue because I find it to be one of the most distracting colours. I've used displays that have a blue, low-intensity power indicator LED, and I just can't concentrate on work as my eyes are constantly drawn to the blue speck. Same with my Asus laptop from time to time (power button lights up blue), but since I'm not staring at the light dead-on, it's not as bad.
Green and orange I have had no difficulty with. Same when sleeping: green light doesn't disturb me (modem, old case), but blue makes it harder for me to get to sleep. This is one reason why I've disconnected all the LEDs from the bedroom P182.
I'm sure I've read about the detrimental effects of "blue" light on sleep/rest patterns, but I can't dig up any sources right now.