Here is a reminder of the kind of voting systems we have in Australia. Not all use the same system. Aside from “First past the Post’ (as in the US) which is not used here, we have ‘preferencial’ and’proportional’ voting systems. This article by #RichardDenniss in The point, clarifies this:
https://thepoint.com.au/opinions/260324-what-the-south-australian-result-shows-about-how-elections-are-really-won
For my money, proportional is the best as in the ACT.

