Is this done because they don't have a front led like we do?
It's not pointless. On iOS this feature is part of accessibility. So deaf people can activate video calls or know there are new messages. They can't hear, but they can see a LED poking them in the eye. Personally, I already asked months ago if someone was interested to develop such a feature, but nobody was interested. It's nice to have it on N9, whether you would use it or not. It's about improving the phone itself.