Firstly, I think house prices are ridiculous. In no way do I think they are reasonable.Which FHB can realistically buy a median priced house in Auckland without the help of Mum & Dad?
Are you against a DTI or just the ratios?
I think a DTI is a good idea, and the proposed ratios are probably OK.
Having said that, I think it is unwise to borrow $700k for a first home. I can't see that, or anything above say $500k for a first home is reasonable. We went overseas and scrimped and saved (and sacrificed a lot) to save a decent deposit on a first home., in our 30s Which wasn't an incredible house, but a start. Cross-lease, shared driveway, smallish section, 3 bed / 1 bath. Everyone seems to have a long wish list these days, and can't see that their first house will probably require a few sacrifices
I think that FHBs should be realistic and starting at the bottom, rather than in the median. Your forever home is probably something you buy much later in life.
And I also think people shouldn't get too caught up with keeping up with the joneses. Too many glossy magazines and reality TV showing beautiful homes