Britain gave up powers on colonies in 1934, and in 1941 Australian parliament accepted it, when Singapore fell, so it could ask for US assistance.Cool-dude said:Yes we do, If we were a republic like the US we do not need a head of state. But because we follow the monoarchy (British) we need a head of state in the parliamentary system. The head of state are chief representative of the monarchic. To answer your question, the head of states has limited of power to govern the country, as we all know that the cabinet or Prime minister has the power (Federal). The head of state has a SYMBOLIC role, symbol of the unbroken continuity of the state and monarchy and british control and rule.
The head of state are chief diplomatic officers, they accredits his or her country's ambassadors, High Commissioners. THey do this by sending formal letters etc.
There are several more, but most of the roles are not used here in Australia. As we are a nation that provides for ourselves. Also like Canda.
Moreover, most of british former and current colonies are slipping away.
Again, Yes we do need a head of state but their roles and influence are slipping away.
As we continue to follow the monarchy we must have a head of state the symbolise the british control, rule and influence.
If we become a Republic then the Head of state have a more greater role.
Also we need a head of state as queen is useless