How is this allowed, you do not even have to be a politician to be elected as president of the USA

While Australia's constitution was modelled off America's, Australia's government is still heavily borrowed from the West Minister System, where Parliamentry Supremacy exists and the Prime Minister is both a executive and legislature.

Australia was still fairly conservative to British Imperial jdeals and couldn't go all the way to a American style government. In America we use a fully seperate three branches of government, only exception is the office of Vice President, who is Legislative Branch as President of the Senate, but can assume aspects of Presidential Authority over anything except the Department of Defense with Presidential permission. President still has to sign everything though, and can override any tie breaking vote a VP makes with a Veto, so it is a fairly powerless position, unless you plan on using the 25th Amendment to replace the president which Kamala Harris apparently threatened to do if Biden doesn't step down.

Ummm..... our constitution goes farther. In order to be a supreme court justice, you don't even need to be a judge, or pass a bar exam. Heck, you technically don't even need to be human, we can appoint a monkey to that position if we really wanted to.

Congressmen and the Presidency have stipulations on who can be in office, with residency and age requirements.

Well we've had it with career politicians

Polititian is an occupation of nare-do-wells

Unfortunately this is a Republic in the since of electors.

Few understand what that is. It's sort of like what you're talking about with your parliament. Yet they are the ones that elect the president. Not the popular vote.

It's definitely not democracy. Yet not all out are republic though it is far closer to a Republic than a parliament.

In Canada you have to be chosen leader of your party of which is the governing party. You don't have to be a sitting MP. We had a PM named John Turner. He sat in the visitors gallery after he was chosen to lead the governing Liberals. He was elected to parliament in a by-election then called a general election and his party was defeated. He resigned shortly thereafter.

It's a republic, not a democracy...

Perhaps because you're still part of the Commonwealth. We completely we went full rogue mode some 250 years ago.

So? Does Australia have a perfect government,? It is a different system.

We also don’t have kangaroos and eat Vegemite. We’re American, not British.

That is true if the people vote for u u can win the office

Goverment of the people,by the people,for the people.