Isn't this whole thread about reduced longitudinal stability in some helicopters, and the requirement for a visible horizon in order to match the limitations of the pilot's central nervous system feedback loop?
Call me a CASA-phile if you must, but I'm quite happy to have pilots of reduced-stability helicopters required to have a visible horizon.
Now if CASA are talking about stopping me from departing
runway 36 at Mount Gambier on a moonless night in your single AH equipped Cherokee
well that's a different story.