Been busy, and thus, late to this party, but wanted to say I appreciate the topic, especially coming from TD. He has always been reluctant to put any theory in writing, as it might dampen his image as an iconoclast. I gather he has been asked enough, he sort of had to come up with something.
I have often put my basic philosophy in writing, not fearing being trapped so much. If I want to ignore my own philosophies, I figure I could just say, "It's an architects prerogative to change their minds" or say its a special case and the site doesn't allow it, or that I am giving the client a unique (at least for me) hole. It's hard for me to understand beginning design without some basic philosophy to guide it, even if I decide to ignore it a few times. Of course, you ignore it too often, and pretty soon you just get goofy golf.
A few things stand out to me. First, Eric's use of stats to dispel some myths about how easy bunkers are for even top players. Approximately doubling the distance to flag and halving the % of greens hit in regulation seems like a pretty tough penalty for those guys.
Another is Tom's admission that players probably hit away from fw bunkers, at the top and bottom of the spectrum, with the middle handicap men not realizing what they should do, perhaps letting ego take over. I have always wondered if the Golden Age philosophy of making them challenge a fw hazard was ever statistically a good idea or played as designed. With more stats now, intuitively it seems not. Although, it seems it still works for what was the presumed target audience of design back then, so maybe the ideas were perfect for the times. And maybe other ideas are better for these times.
Lastly, TD's bunker philosophy is far more main steam than most here would think. Like football coaches, and other gca's, I think the tendency for all of us is to get more conservative with age. As with the center bunker idea - you build a few, get no positive reaction (except on this website) and a few negative grumblings, and voila, center bunkers are not on your hip pocket list of design ideas.
I eagerly await Tom's philosophical discussions on green contours, fw width, etc.