If you aren’t voting for one specific person to be your representative, but rather, for the party as a whole, you generally want individual representatives to follow the party line, unless there’s some sort of unusual drama that splits opinions long after the last elections.
In countries such as the US and the UK, you usually vote for one person to represent your territory, but in elections such as the European ones, because you’re voting for lists of people to represent your country, you’re actually voting for a party.
No idea about how Australian democracy works, though.