Brent,
The problem with your answer, and Jim's question, is that you can't maintain a course for a local club as if the U.S. Open is being held tomorrow.
The average to higher handicap golfer has difficulty with bunkers and deep rough and certainly the dual combination tends to be disastrous for them.
Those positing that bunkers should be difficult probably never sat on a board or green committee and as a result, were never assaulted by the membership for establishing difficult conditions.
It's a delicate balance, probably more difficult today than in the past.
You want to provide a challenge to the better player, but not to the degree that the mid to high handicap doesn't enjoy their overall challenge. And, at greenside bunkers, it's impossible to seperate the levels of play.
Where soils permit, bunker depth, rather than bunker conditions might be an answer.
But, when preparing a course for daily play, by good, bad and mediocre golfers, I think it's more difficult to produce a challenge commensurate with each level's game.