On second thought, I think the reason so few fortress greens are built these days has less to do with the blind approach than the unnatural look of them. Aesthetics are much more important in selling golf design these days. Exhibit A: Fazio.
C.B. MacD, Raynor, Dye, Nicklaus and Simpson (Cruden Bay) had/have fewer reservations about building holes that are straight forward artificial platforms for strategic shot-making. My sesne is that they often didn't try to make their holes look natural if it reduced the edginess of shot choices.
The Shorts, the Biarritzs, the fortresses, the railway ties, the whole bit, evidence a very different way of viewing the ultimate aims of golf design than those of, say, MacK, Ross, C&C or others.
It takes a lot more guts these days to design a course that has shamelessly artificial features. That branch of gca has always been a wonderful counter weight to the naturalists. I hope it doesn't disappear.
Bob