Dick,
This post is probably five minutes of my life I'll never get back, as your track record of answering people's questions on D&G is not great. However, here goes:
Why would we (Australia) want to adopt an airspace system where the air traffic controllers routinely provide services that are not IAW the airspace classification (either more or less service)?
Without needing to get into the detail, surely this practice of controllers 'making it up as they go along' is indicative of an underlying system that is fundamentally flawed.