Looking at in terms of the three elements we so often talk about when consulting thoughts are as follows
Strategy - The essence of playing the game, creating interest and challenge for the golfer, no matter the ability. All of the key phrases apply; risk/reward, heroic play.... Utilizing a diagonal echelon of bunkers that allow all strengths of golfers to negotiate (The 5th at Newport or the 15th of Suacon Grace are wonderful examples).
Naturalness - We have seen more bunkers being removed that did not fit with the surrounding natural topography. The thought of placing a bunker here or there with it blending naturally becomes bothersome even for those with an untrained eye. "it just doesn't feel right" One thing that I love about Tom and his guys, Gil, C&C and much of the recent movement is that there is such randomness is the positioning of bunkers and yet they appear to natural. As though they belong. So many of the classic courses we study have those bunkers that were plopped somewhere for one reason or another but were constructed in such contrast their surrounds that they do not fit. That is not to say the bunker is in a bad position it is in the execution of the construction.
Variety - Tom hit the nail on the head relative to positioning. We get tired of seeing holes where greens (and fairways in some instances) are always bunkered left and right. Hole after hole, it gets boring. The course becomes indistinguishable. And yet, we have seen courses with a plethera of bunkers creating a sensory overload. Variety is necessary when thinking of length, position, groupings, left vs right side........