Could the difference have something to do with NSW COVID cases occurring amongst the well-off, who can afford to isolate etc, while Victoria's spread happened in low socio-economic areas, often people who don't speak English good, who kept going to work/having large family gatherings. Neither of those situations - other than better non-English communication - has anything to do with government response. COVID is far more likely to spread rapidly if a poor immigrant catches it in a meatworks, goes home to a family dinner of 12, gives it to his brother-in-law, who spreads it to his workmates at his two jobs, etc., etc. Snowball effect. Whereas Bryson and Prue from the northern beaches just have to choose between Ubereats or Deliveroo for a few days.