The main advantage is a negative one: it doesn't have the disadvantages of divided government. The idea that governments have disadvantages rather than advantages is an aspect of Churchill's famous quip that representative democracy was the worst system of government in the world, except for all the others that humans had tried.

Overconcentration of power is a risk I've discussed elsewhere: I think the best solution is internal checks and balances. I don't really see that the states acts as much of a check on the federal government anyway.

An enforced uniformity might be important for some countries, but not, in my opinion, for Australia. The divisions within Australian society are between city and country, or along ethnic lines, rather than geographical at the level of states.

The big issue is isolation. A single monolithic government may find it hard to administer Australia without becoming remote from the small scale issues. We'll look at possible solutions in the next few slides.