I think the peanut gallery here overestimates the difficulty of shaping mirco features with dozers or something smaller. Shapers are great at that kind of stuff. I have put flags in the ground, and had them dump a few loads of dirt here, there and everywhere for the dozers to create something, partly smoothed down. I have seen instances when the repeated tractoring of a fw to clear weeds, prep for planting, etc. have softened the final look, but in reality, most of the time, if a tractor with blade can transverse a contour, its a good sign that mowers can and it works out.
I may be wrong, and the history of gca is, as I've said, "just a whole bunch of things that happened" but I feel like JN and other tour pros brought designs where the fw was smooth, as some sort of reward for placing the tee shot there, rather than another challenge that randomly affects all shots, or a hazard that would direct good tee shots to the rough. It fell into the idea that hidden hazards are no good, so if you couldn't see mirco contours from the tee, they were bad design features. Of course, concave fairways became popular for their playability benefits of holding shots in for similar reasons.
And, again just MHO, but reintroducing those is probably a more important innovation of CC and TD than frilly bunker edges and other items that sort of define post 2000's architecture.