I'm pretty sure I saw it on a few of the 777's as well. What's the technical argument for that anyway? Less wear and tear on the motors, flap rails, fairings etc?
Reason I ask is several years ago I flew with an EK 777 to Nice and noticed one of the inboard flaps having a huge dent in it, underside would have been perforated to bend the (to me visible) top side outwards that much. I told the crew which caused a little bit of eyebrow lifting on the part of the (relief/training) captain that came to take a look. It would seem that the habit of leaving flaps extended will make ground handling prone to running into flaps with catering trucks.