That would be because it gives ATC an additional means of managing congestion on either side of runway 07/25 (particularly on the domestic side), and in both directions. It takes very little in the way of traffic to create a log jam at domestic, particularly when 16 is the duty runway.
That's my take on it anyway.
Last edited by Hugh Jarse; 6th May 2015 at 22:43.
Reason: clarification