I am fully aware of the effects of fog, but the part I don't really like very much is the fact that the flight the day before left SYDNEY for MELBOURNE when Melbourne was fogged in with only one hour's hold fuel before diverting to BRISBANE. Why would you depart Sydney with Avalon fogged in with no prospect of improving?
The decision was because that was where the flight was next operating to.
When you have a passenger load, your responsibility is to those passengers and how they can be best accomodated in terms of future flights... to fly them to Brisbane instead of Hobart, Launny, Adelaide or Sydney where they would have had a faster turn around and return flight in order to keep the next flight on track is very strange. Even stranger is only having an hour's hold before having to divert in the domestic environment... this isn't longhaul flying.
As to CAT III... it has been promised for Melbourne for this winter, and as you can see the works have certainly been commenced... new stop bars, holding points, and the new ILS a year or so ago. The AIP now includes the Low Vis information, so it is clearly coming... just have to wait and see how long.
It is the airport operator's responsibility to provide these services, and as part of operating an airport they should be required to provide those approaches, especially MEL and SYD.