It has been said on here numerous times that the domed greens seen currently at Pinehurst #2 are not 'native' to the design, meaning the greens, in the present form, were not the greens designed by Ross himself. It has been noted that the present contours were happened after years of topdressing and other work. I would wonder how different the greens were when they were first built. (I have never been on the property at Seminole to comment about those greens) Having also seen the greens at Mid Pines (a course noted to be one of the most original Ross courses, especially in the Pinehurst area) that are far less contoured and far less likely to drain off many sides, as supposed here.
Now, that being said, I certainly think that modern, subsurface drainage would reduce the need for run-off areas and multiple drainage features put into the greens. But based on what I know about the greens at Pinehurst #2, I would wonder how many of the features we praise in and around those greens are truly designed by Mr. Ross. (I will also note, that those dominant run-off features seen on #2 are not nearly as pronounced on #1, #3, Pine Needles, Southern Pines GC and Wilmington GC)