We did not create that, though we still have to muster the capability to take sustained advantage of it. But a well-managed and well-supervised banking system is not an accident.1 Years of careful work both by banks and APRA went into that outcome. Nor was the ability to respond forcefully, but credibly, with macroeconomic policy just luck.
You don’t suddenly acquire the credibility needed to ease monetary policy aggressively while the exchange rate is heading down rapidly. Authorities in lots of countries would not feel they could do that. At an earlier point in time we probably would not have felt we could have done it either.