Pat,
I understand your point. Perhaps even agree with it, based on my own post. That said, IF you believe that, say, a nine iron ought to be punished more severely than a 2 iron approach, the green side bunkers MIGHT be 9 or 10 feet deep in a proportional based design. If they are reduced to 3-5 feet so golfers can see and play out of them, then the proportional penalty of those has been affected.
I will grant you that few follow this theory. Even on the old Scottish courses where bunkers are deep and sod faced, I can think of few if any where the depth seems to vary consciously with the length of the approach. But there are some examples - Pete Dye's famous Tip O'Neil bunker at TPC west is on a par 5 where the approach is nominally a wedge. I don't recall too many Pete Dye bunkers as deep on long par 4 holes, but he has put water against long par 4 greens, a la TPC Sawgrass and many other 18th holes.
TMac,
I don't know why, but my iniitial reaction to your question was either Rees or RTJ. They focused their US Open style bunkering at the LZ for good players and generally guarded all of them about the same toughness albeit with some variation. Maybe that is more the "stern examination" rather than proportional punishment.
The more I think about it, the more I agree that striving too hard for proportional punishment is an albatross. Those who raise the issue usually do so after finding themselves in a difficult spot, or having lost a shot or two from a difficult spot. How many times have we heard someone bring up the topic prior to losing a shot? This thread and.....ah.....well no where.
I agree with the concept of simply providing the widest variety of recovery options, and as far as possible, in the widest variety of areas relative to targets, i.e., having sand bunkers, grass bunkers, chipping areas, etc., left, right, back of the green. Over time, that should eventually give all golfers who tend to miss a certain side a variety of recovery shots to try to execute, focusing on their own fun and improvement, rather than some theoretically perfect punishment for their golfing crimes.