People make constitutions to deny rogue politicians power.
The most important function of a constitution is to give the People the opportunity to get rid of rogue politicians quickly and easily, without a revolution, but with a free and fair election by which the acceptability of the government can be tested. In days of yore the Crown represented total power. Today it represents the denial of total power. No wonder the republicans want to get rid of it in their grab for power. The Reserve Powers of our Crown have only been used twice in our history to rid ourselves of rogue Governments - the Lang Government in NSW, and the Whitlam Government in Canberra.