Was trying to explain this the other day on a radio interview. You can place bunkers to suggest a certain shot type, or more specifically, set the target angle. As I have mentioned here, if the wind blows left, the green angles left, most players capable of doing so are going to draw the ball, etc. Even the RTJ pinch bunkers at the fw landing zone suggest a less than full power swing, or less than full driver, almost as much as they are penal.
As to random bunkering, try selling that to most of America's 15,000 course owners, given the maintenance costs these days. They are all trying to reduce bunkers, and if they don't see at least a few rake marks a week, they consider the bunker "under used" and not worth the effort. Oddly, many also want to take out the most heavily seen bunkers in the name of pace of play. Have never figured out exactly what the "right" amount of play is.
Frankly, although OHCC can afford it, I found myself wondering what the point of Gil adding fw bunkers on the par 3 9th was? There is a way to stagger bunkers in an attractive pattern without getting too far from the prime landing zones. The best bunkers serve play purposes first, aesthetics 1A, and hopefully those and a few other functions besides just looking great.
As to moving them out, yes, especially for a course like OHCC who host tournaments, but not really necessary for the other 14,800 American courses, is it? Sometimes you can add one at 290-320, and other times, that isn't worth it, as you can add mounds, contours, whatever, or narrow the fairway if you want to stop the long hitters (yes, in those cases, I rarely see anyone thinking in terms of creating a shot type for a 320 yard drive.....It happens, like the CC Plantation course.