Keg
Or that 16L/ 34R is too short.... and the taxiways leading to/from it don't have adequate wing tip clearance to permit 'super' or even 744/ 777 arrivals from east to land on it. That's what creates many of the over flys from the east.
744 and 777 can operate to/from 16L/34R, with the 773 there are restrictions, with the 744/772 there are none (well hardly any).
The reason 744 don't operate is three-fold,
1/. SACL wanted the taxiway shoulders to settle after the runway opened (1994);
2/. SOP for the local 744 operator effectively "banned" ops to/from the runway;
3/. Noise issues
wingoes
Normal international practice for rwy assignment is according to the direction of approach.
IE at sydney, from the east 16L/34R and from the west 16R/34
Might work if Melbourne was deemed to be east of Sydney.