Without wishing to step on any toes, perhaps I can give an outsiders perspective
The insularity of this discussion reminds me a little of the ‘pokie’ debate, whereby the received wisdom of those states with pokies is that pubs and clubs simply could not exist without this revenue, meanwhile the rest of the world, and parts of Australia carry on as normal running businesses based on selling booze, food and good service.
Apart from Canada which has a diluted version of NG, no other country I have been involved with has a similar system. In the UK you can have a property company, and offset losses and gains within it , but you cannot carry losses across to your personal income (say 400K a year from working at Mcquarie Bank)
When interest rates were 8% in the UK, I would expect a rental return of say 12%, otherwise why bother, similar in Germany. Hertz don’t rent out cars for a loss after all.
The problem I see here, is how ever well intentioned NG was in the first place it has attracted a particular type of investor to the market, with an eye (though not always) to capital gains, who can afford to bid up the market in order to ameliorate their tax bill.
Genuine (not nominal) capital gains are not sustainable in the long term with established housing (see the Herengracht index).
Housing is a utility, and a house requires maintenance, something wilfully neglected in many Australian cases due to the poor returns.
The net result is a mindset that accepts the idea of a loss making business, supported by the less wealthy tax payer. The cost is growing and becoming more entrenched every year, and no one has the political will to tackle what has become a sacred cow, unique to Australia.
Rents are set by the market, not landlords, I don’t buy the idea of benevolent landlords not charging pretty much what the market will bear, I didn’t, why would you? And consequently I don’t see landlords being able to raise rents at will if things changed.
It is in my view a silly and potentially dangerous system, but hey, maybe the rest of the modern world has something to learn from Australia on how to meddle in a market.