George,
Interestingly enough, I was about to start a similar thread, due to Tom Doak's thread.
The use of every club in the bag is more about the overall tactical balance of the course without weighting it in favor of one method, or a few methods of play.
Call it diversity.
Call it a thorough examination of the golfer's game, but, doesn't the architect have an unwritten obligation to explore and test the golfer's abilities with a wide range of shots, from Driver to fairway woods, long, medium and short irons, along with pitching, chipping and putting skills.
Do the better courses present and test that wider spectrum of play ?
Should they ?
While some criticize Pete Dye's short 17th hole at TPC, I think it presents a very unique and dire test, one of judgement, skill and nerves on a predetermined shot.
I like that the architect sometimes forces a golfer to execute a particular shot, I think that's part of his obligation to the golfer.
The other aspect of this exercise, that of hitting every club in the bag, is that it inherently presents a moderate test, not an easy one, not an overly difficult one, but a moderate test that all can aspire to meet.