It never has, even back when all the Android devices had LCD screens. I'd mostly chalk it up to not having the UI bits that normally were blue in (i.e.) gmail,

It never has, even back when all the Android devices had LCD screens. I'd mostly chalk it up to not having the UI bits that normally were blue in (i.e.) gmail, so the blue just didn't show up. Text is black on white, buttons are black on grey, and there's not a lot of space left.