As I said on another post ATC will not use 09 if another runway is available due to the complexity of coordinating with Essendon and arrivals from the east. Why Essendon wags the tail of the dog is a mystery.
Similarly, ATC rules preclude any runway as duty runway with more than 5 knots tailwind dry and zero wet, regardless of aircraft performance capability.
Once 34 or 16 are designated as single runway ops. departures of 27 to the north and east conflict with departures off 27 to the north and east. Hence departures of 27 are prohibited, hence 45 minutes holding, hence 30 minute queues on 34/16.
You might, however, get lucky departing to the west off 27 if there is a gap in the sequence. Its lazy, its third world but thats aviation in Australia in 2019.
Maybe there is an ATC apologist out there who can better explain why this lunacy continues?