Since Malcolm is my local member
I'm thinking of writing direct to him explaining why this whole thing is a bad idea in principle, without worrying about how screwed up it's going to be in practice.
What the Feds haven't yet grasped is that while a one-stop-shop is appropriate at some levels, it's completely inappropriate at others. At the local council level, yes it's good to do everything in one place. At the State level it's debatable but defensible. At the Federal level it's a nightmare. I don't want anyone but the tax office having access to my tax data, and I don't want anyone but Medicare having access to my medical data etc. If this data is all merged then we will have 'customer service reps' who aren't experts in any area having too much access to too much data. If the data remains siloed, then the MyGov single-sign on just becomes another layer of obfuscation keeping me from the people in the relevant department who might actually know the answer to my question. When you add on the potential for identity theft when it is all screwed up it's definitely a bad idea.