Originally Posted by
docbert
It's the difference between carrying your bags at most a few hundred metres from the luggage belt to the re-check area (via customs) to potentially having to take them on a bus/train to another terminal and then line up to check-in.
Most capital city Australian airports are still suffering from the strange Government policy of 50 yrs or more ago of having separate international and domestic terminals. It is only the more recent airports (such as MEL Tullamarine) where domestic and international are together.