Yeah bank transfers have always been reliable for me in sunny Australia but the issue pre-the NPP is the time it takes to transfer inter-bank and/or inter-credit union.
It’s particularly a ‘problem’ when your payments are delayed by public/bank holidays (especially those that only occur in a bank’s home state!) and feels particularly anachronistic compared to modern payment gateways.
Out of that $1bn AUD, probably half is on banker’s wages :P