Every ambulance system, and hospital system has issues. NSW ambulance does a lot of things very well, and some things not so...don't forget population density, traffic, and admission rate are 'generally' higher in & around Sydney's major hospitals. If you have ever seen St Vincent's ED on a weekend, it is amazing, 11 crews waiting in the corridor just to get beds, a lot of the time more, 11 cars!
I am in no way criticising SAAS, it is such a large system, and it does very well. SAAS and the crews have been cooperative and friendly in all encounters.
Following on...if the patients are not ready, there isn't much that can be done. I just find in that going to the wards that the patients seem to be ready much more quickly for Tx, they make a special effort to clear. If they think all SAAS crews are out on Emerg jobs, or in Tx, they will not increase their throughput as the patient has nowhere to go.
A holding area is a great idea, push as hard as you all can to get it in the new hospital when it is built.