Tannin to clarify what I am saying - if someone puts a "1" above the line rather than number all the boxes below the line, and they have no idea how the preferences are distributed, then they could in theory be voting for a major party.

IE: I put a 1 against the Zoo party and that's the only vote they receive and their preferences go to Labor, then under the 2 party preferred system my vote effectively ends up with Labor. However, if I number all the boxes below the line then I decide the order my votes are distributed.

Likewise, the recent election(s) highlighted that a vote for Green resulted in a Labor government, but a lot of Green voters didn't realise that this would happen (similar to the support of the Independents for Labor which many people didn't see coming).

I am not disputing what you are saying, but more the fact that a lot of people don't understand the two party preferred system and preferences.