Also all of these mortgages were supposedly stress tested by the banks before being granted. We have gone up less than 1.5% and it's panic so what were they stress testing to?
It's built into the assessment process. +2-3% stressed rate. Banks risk positions are covered by LMI on high LVR loans and by equity in sub 80% loans. Realistically, in 99% of cases, the bank can get you out of a house and have it sold before they take a loss. So banks don't give a shit past looking to being responsible in the eyes of the law (the nccp act to be precise).
The panic stations are more to do with the fact that cost of living overall has gone up and not just a rate on the mortgage.
Lenders credit engines don't factor in inflation, just an increase to rates. So while you might be able to afford a 4 or 5% mortgage increase, you haven't been assessed as being able to afford that PLUS a 30% increase to basic necessities and other living expenses.
The models used in credit have always been tuned to get maximum money out the door to as many people as possible while looking responsesible based on the conditions of the day while maintaining some lwvel of justifiable risk mitigation. I expect if the market flops and everyone starts being homeless and banks take huge hits, this
might change. Expect royal commission #2.