Lets just see what is actually happening once we reach 70%/80%, and especially what the ongoing vaccination pace is as we cross the thresholds. All premiers and their friends are busy putting words out there to try and stimulate as much demand as possible. Nothing they are saying now is a particularly a 'core promise', they may as well be threatening Year 8s into doing their homework. Their collective underlying fear will be a vaccination rate stalling somewhere near 80% cover, as that will leave us sinking back into the mud. In order to avoid that, and the political poison of a COVID peat fire that never ends, they will say whatever they think they need to right now.
I don''t think each individual states is really following that much of a different path in reality. Put any state leadership in any other states' shoes and you would get roughly the same response. There are bugger all true degrees of freedom, unless prepared to go balls-out loony to one end of the spectrum or the other.