AV is not an improvement as it’s harder for smaller parties/independents to win, the politics remains adversarial, there is a lack of minority and women representation, strategy voting is involved. Also notice how Australia is behind the countries of Norway, Denmark and Switzerland in the international rankings.
https://www.fairvote.ca/ranked-ballot/
https://en.wikipedia.org/wiki/The_Economist_Democracy_Index
https://en.wikipedia.org/wiki/World_Press_Freedom_Index
https://en.wikipedia.org/wiki/Human_Development_Index
https://en.wikipedia.org/wiki/Corruption_Perceptions_Index
https://en.wikipedia.org/wiki/Good_Country_Index