I think we get the argument, or rather, opinion.
To me, the greatest display of leadership was the creation of the bipartisan National Cabinet which from all accounts has worked exceptionally well.
A leader can only lead in the jurisdictional areas that apply in our National and State Constitutions. In prior cases where the states' control and implementation has been messy, the Feds have attempted to take control (eg by using the Corporations Law), but that ability is limited. The Feds, for instance, can only 'offer' the ADF to the States.
Getting back to NZ, as has been noted a number of times, its much easier for the Ardern government to control the pandemic there as they hold all the relevant powers; much easier to appear a great leader.