I was under the impression that air ambulances in Victoria are mostly for rural areas - either responding to incidents in the middle of nowhere, or flying patients to Melbourne for urgent specialist care. Most of them aren't even based in Melbourne, they're out in regional centres like Bendigo and Warrnambool[0].

A helicopter seems like it would be pretty useless for landing in an urban area. I can't imagine winching is risk-free or would save much time, and you can probably put many more ambulances on the ground for the cost of a single air ambulance.

[0] https://www.ambulance.vic.gov.au/air-ambulance-victoria