Scott, you have hit the nail on the head--generic Fazio bunkering. I do believe that a couple of greenside bunkers were added. Fairway bunkers were added to holes, 2, 5, 7,9,10, 14, 16. I played in the past Met Open and Met PGA, and a few assistant events over the years, but cannot be certain about every new greenside bunker. However, I do remember a few greens having no bunkered sides that were actually worse misses because of the rough and green slope. The two side green bunkering becomes redundant after a while. Also, the bunkers are all deeper than previously. There is a first cut of rough. This course is built to have trees, so I really don't have an issue in this regard. However, the first hole probably shouldn't have too many because it appears as though it was a risk/ reward almost drivable hole. The rebuilt greenside left bunker takes this option completely away.
I have a feeling that this was done because of Winged Foot. Stanwich has always tried to emerge from the shadows and be considered WF's equal. They even have an inter-club match and several members belong to both clubs. Also, there are many golfers who believe that greatness is equated with simple toughness--Stanwich was in the original Golf Digest rankings!