Mike:
Excellent, excellent question. This is a subject that we're trying to address at my course. It seems sort of superfluous to have up to 3-4 different "cuts" and heights immediately surrounding putting surfaces plus it's a good question about the general artificialness of the look of it. I think it's just something that's become basically a look of the age although the super talks about mowing considerations, turning, whatever, and not coming too close to bunkering with machinery for one reason or another.
But the fact of the greenspace cut right up to the edges of bunkering on the sandbelt courses of Australia makes one wonder. I'm sure not crazy about the rough cut collars surrounding fairway bunkering either and I did a bit of research on that some months ago from old course photos and it seems that "look" was always a part of American architecture although the rough cut collars seemed to have been shorter in the old days. I like the idea of increasing the effectiveness and function of bunkering by letting balls into them more easily and I like the idea of close cuts around greenspace too as it produces more possibilities of club selection--more options in fact--always a good thing to increase in golf and architecture.