http://forum.xda-developers.com/showthread.php?t=2152373
I do agree that the edges aren't being used enough in terms of taking advantages of the edge screen. I'm surprised more apps aren't available.
I honestly believe it's there for aesthetic form over function tbh.
Even what 'extra' edge options are there - frankly they could be done on a standard screen and there is no reason they wouldn't work just as well.
That being said - it's a very nice aesthetic.