ATC cant handle departures/go-rounds off 09 simultaneously with arrivals and departures into Essendon or arrivals from the east if 16 or 34 are in use. Whats really going to be a laugh is that when the new 27L/09R is built there will be NO increase in capacity under certain conditions for the same reason. Just like the debacle when there is 6 knots tailwind on 27 and holding goes to 45 minutes with single runway ops.Gotta love aviation in Australia.....Worlds best practice......... except for everywhere else.
Oh, and the rumour is 27L will be built with a displaced threshold from day1.....due noise abatement.