So would that include the 18th at Pebble?
I cant think of too many of that length top of my head, but I suspect that some are just eye candy and some serve a valid function.
The 18th at Pebble is probably both, but its primary function I suspect is to reduce the risk of going for the green by reducing the severity of punishment for a miss. If missing the fairway by 1 inch means you are in the drink then I suspect most would chicken out. But with that long bunker, missing by an inch now only costs perhaps half a shot, and so worth a crack.
Last week Mike Clayton came out to my club and changed bunker. The old one was perhaps 25m long and 3m deep on steep side of a green set high on a hill. If the bunker were not there, the slope is so severe that misses would kick hard downhill 40m away from the green into the trees, and so to an extent the bunker was there to make life easier.
For a variety of reasons, the bunker was last week divided into two smaller bunkers, with perhaps a 8m gap in between them. The bunkers themselves are still severe, but I am waiting for the first committee member to pitch one into that gap and kick 40m down the hill into the trees. Will be screaming blue murder I suspect