Ask Aussies this, do you trust the Queen to be impartial and to do her best for all Aussies through the GG.
Would you trust some old hack of a politician appointed by the party in power to be impartial ?
Still the republic option! Hereditary privelege is daft.
And moreover, even the indirect election model proposed used a two-thirds majority of both houses. That's 151 MPs. Even in the most landslide election you're not going to have a single party have a 151 member caucus (thank you, proportional representation in the Senate).
That means it has to be a consensus candidate, not a "old hack of a politician". Currently the governor general is chosen by
one MP out of 150 in the lower house. The republican model would be a big improvement on that.
Moreover, given the 2-thirds majority requirement and the ability of the public to nominate candidates to be put to parliament, you can't even prove the candidates would
be politicans as opposed to judges or activists or other serious public figures.
But let's assume it is former politicans being chosen. It's all well and good to go "ooohh politicans suck" like reflexive cynicism makes you clever and insightful. But here's the thing: if the nominees were politicians, at least there'd some
merit and
democracy behind why they were considered prominent and popular and cross-partisan enough to be considered viable candidates. And at least they'd be chosen by 151 MPs rather than just one like currently.