Olgaga firstly that's an article from a journal owned by a very right wing media organisation, Fairfax. No offence, but it's hardly something to base your whole opinion on. You might as well link to an article in the Daily Mail as sole backup for your legal opinion. (And I really don't understand why you mention New Zealand, either. It's a completely independent nation with totally separate laws and judiciary - isn't even part of the Federation - the article doesn't refer to NZ at all.)
Secondly, as I explained, the law will have developed hugely from where it was a decade ago, when I studied it - there were only individual state laws on de facto relationships then, not a Federal one as was passed in 2009, for a start. So I can't really comment on the law as it at the moment in Australia, because I just don't know enough to do so, and nor do I have access to the scholarly journals to try to form an educated opinion. I can say that the more I looked into it ten years ago, the more I felt Australia had moved too far into acknowledging relationships of relatively short duration, and that the right of people to have brief live-in relationships without ever intending to become life partners was being infringed upon in a way that seemed unreasonable. That was why I thought, at that time, that after 5 years without kids, and after being together for 2 years before having them (because of the fact that statistically, a mother usually starts providing far more domestic labour after kids arrive, and is usually primarily responsible for the child - though not always) it should be open to the weaker party to seek to establish a familial tie in court, if they needed financial support as a result of the relationship's ending. I also thought you should have a staggered degree of responsibility, just as you do in marriage in this country; a marriage of 5 years' duration does not entitle you to anything like as much as one of 35. And I thought de facto rights shouldn't be equivalent to marital, because of the lack of provable clarity of intention. But to infer no family-type responsibilities at all, especially after long relationships, just seems unrealistic. Not to mention, after very long relationships, cruel.
Again, there are no simple, wholly successful solutions to a problem with family law. It's always a mess whatever you do, by the very nature of human relationships. Find me a fully litigated contact dispute which does anything but devastate all sides, and I'll be amazed. And would you say that the number of men wanting DNA tests to delay CSA payments means women shouldn't be entitled to chase fathers for maintenance at all? Or that disputed versions of events in child contact disputes should mean the non-resident parent has no recourse whatsoever, when wanting to see their child? Mess is just what happens when two people who once loved one another deeply are trying to screw one another over. It's what family law is so often all about.
I am very ready to believe it's a mess in Australia, but so is the law in this country when it comes to cohabitational breakdown. Family law is messy. The only question is how the balance between individual rights and competing freedoms is struck, and there will always be winners and losers from a system trying to impose structure on individual lives. The only question is whether a legal framework helps more people than doing without one, and the answer to that is always going to be unknowable, really. And probably, like divorce, or child contact, very dependent upon who you know and what their experiences have been. Extremely subjective.