This is a very good point about Redan-type holes. One of the first things that Geoffrey Cornish did after being asked to visit and consult at the Colt-designed Country Club of Detroit, was to restore a back-side apron to their Redan, I believe it is 16. Previously, it had been a typical raised island green sourrounded by rough.
To me, it isn't a Redan without that feature. But not because it offers more bailout; rather, because it places a premium on picking a strategy and then playing to the correct distance.
Great pictures; thanks for this thread!