Australia generally had a good Covid epidemic, with early intervention, restricted international travel and various amounts of interstate travel jurisdictions leading to very low death tolls [zero covid deaths across the nation sometimes], which allows contact tracing and other suppression to be worthwhile control methods.
Ys, it definitely helps to live on an island, but in the first 18 months Uruguay and Paraguay, both bordering Bolsonaro’s Brazil - which frequently hit the top 10 fatality charts, and Vietnam all did phenomenally well, so the island thing alone is no answer.
What worked well for Australia was we closed China inflights early, and were fairly quick with others. A national cabinet of the Feds and states / territories, so that all of the states (who do the heavy lifting in the medical system) had a clear stake in a single coherent national position. Australians are generally not fans of politicians, but they expect them to step up and earn their pay in crises, and will follow instructions that do not seem to be too self-serving or stupid. The state premiers took on a much stronger leadership role.
The National Cabinet were advised by a committee of the state chief medical officers, so there was a clear distinction between the medical advice and the political position. Its a little thing but the transparency of that feed of ideas into policy matters a lot in convincing people to put trust in expertise.
I think all the state premiers early on established a daily covid press conference, where they’d repeat some key messages, and then the Chief Health Officer would give details on cases, issues etc, and journalists could ask questions. It really helped to have a single source of truth as to what the requirements were, and how and why they would change (often flagged weeks in advance).
I think we were lucky to have two very strong leaders in the most populous states who became a de facto national leadership couple (one Liberal, one Labor), but none of the premiers proved to be a dud.
Another thing that was really important in Australia’s success was that in 2019-20, just before Covid we had a horrific and unprecedented fire season across the country. It really shook out the emergency services, the links between different agencies and lines of communication and command. It made the switch to covid as the issue far easier, and with well-tested and tuned machinery in response. The states accused the Feds of dropping the ball, so they were extra-keen to be quick in stepping up when covid appeared.
Overall, trust in government so that there was a single coordinated national response cascading down smoothly to all levels of govt was critical. Having a structure where technical medical expertise was allowed to do its thing and politicians put in a position where they had to justify their response on the evidence was also critical (and unprecedented). The third was the quickness of the response, so that cases and fatalities were kept low and could allow further suppression measures like contact-tracing to be effective.