I agree with you the RTJ's early bunkering was more dramatic than what's commonly remembered now. I believe his original work at Oakland Hills was very much in this style, and I remember for sure that at some point the club restored splashy, lacy-edged bunkers like what is shown here. [I saw these in person, either in the 80s or early 90s, several years before Rees's work.] But the frilly edges didn't last long under heavy play, and they were gone in a couple of years, probably just like the original ones.
How much of that should be a concern for modern architects who are installing frilly edge bunkers, especially in non-sandy soil? Should we expect that over the next 20-30 years a noticeable number of originally minimalist/naturalist courses will have kidney bean shaped bunkers?
Ben:
You are confusing minimalism / naturalism with frilly edged bunkers. I don't think RTJ was a minimalist or naturalist, although maybe, if you're comparing him to Tom Fazio instead of to me.
But to answer your question, absolutely, bunker edges like that are hard to maintain and tend to become lost over time. It happens much faster in places with:
a) warm-season grasses that must be edged regularly,
b) 12-month growing seasons
c) heavier, more fertile soils which encourage growth and are more prone to erosion
It's not that a golf course superintendent CAN'T keep the look if he is putting in the effort and has the budget to do that, but it's certainly NOT effortless, because that look is not natural in the aforementioned settings.