I often hear a similar statement that "if you can dive in Melbourne, you can dive anywhere". People use the same reasons, it's cold, low vis, often high current etc etc. and many of the wrecks are deep.
I will say that diving to 70ft here feels less comfortable than diving to 140ft in the tropics. But maybe that just means i need to buy a drysuit.
And the meat pies in Melbourne can be a challenge, too!