A lack of weather awareness that also stands out is that the showers that grounded them in YWBL were heading East. The same showers would be between them and Moorabbin (and Cobden). Also there seemed to be lack of any real statement that they had much of a look around at the weather around YWBL on arrival. What was the weather looking like to the West, where prevailing weather was coming from on the day.
There are approximately 18 weather cameras between Warrnambool and and Avalon not inclusive too. I wonder if they used them or just flew into the crud unaware.
I agree, however I have been tricked by the cams at least once, where fog lifted, I looked at the cams and departed, only to find out it rolled back in shortly afterwards. No big problem, I was carrying fuel for a good alternate. Cams are a good tool, but use them with caution.