Two of the reasons I feel central hazards are not used as much as they should are:
1. There are too many golfers who still think that when they hit a perfect drive down the middle of the fairway, they should not be rewarded by a bunker shot! Yes, I know, its stupid. But that's been my experience....
2. The need for more space to accomodate the feature makes it tough to use for an architect, unless he is working with a piece of land with ample room to spare.
I, for one, would like to see and use the feature more often.... But I am working on that for one of our next projects in Quebec....