Are you suggesting the banks should be providing this level of detail? Are we completely absolving borrowers of all responsibility for their decisions?They use maths, but the variables and limits are controllable when considering borrowing power.
They don't let someone on $50,000 p.a. borrow $1,000,000.
Do the calculators line out the repayments at different interest levels to show people what they're in for when circumstances change?
Most of what you're demanding is a level of knowledge and education that not everyone has, but the bank lending them definitely does have. Most buyers are also at the mercy of the market itself, if you want to buy a house with any level of proximity to Melbourne, it's not cheap or affordable by any historical measure.
Rightly or wrongly, when people see the bank say 'you can afford to borrow x' they assume they can. People lacking financial literacy are the most deeply impacted by this stuff, who are mostly going to be low-to-middle income earners.