I've kept silent on most of your other commentary, but this one just shows your absolute ignorance on the topic you mention & requires correction for the benefit of anyone reading.
Firstly, let's look at the USA... interest rates are far lower (& historically so) than Aust., median property prices are lower &
the interest on your PPOR is tax deductible!. Yeah, you read that right... so please enlighten us all on how you managed to conclude that nonsense above? Something about "homeowners with mortgages in these countries..." In the USA, buying a PPOR provides significant tax mitigation to the point that it often makes more financial sense to own (with a mortgage) than to rent and save....
Secondly, you obviously aren't aware of other incentives offered in the UK or other European countries either, for the purchase of a PPOR. Ever heard of the UK mortgage interest relief program for home purchasers? Your comments above suggest not.
Thirdly, the quickest way in Australia to own a property (for those of us that can't live with mummy) is to find low cost rental, buy an affordable IP, use the tax advantages, rental income & personal savings all combined, to greatly accelerate complete ownership. But you would need to understand basic math to comprehend this.....