I find it very annoying that to do your taxes yourself in Australia you must have an Android or iOS phone. There is no way to authenticate via the web or just sms on a dumb phone.
Personal tax is via mygov which is SMS 2FA.
Business tax (which I thankfully haven't had to do for a while) has always been "difficult", it was an awful Java applet for a while there.
Edit: I think I realise now my mistake, the new beta/govid looks to be following that path. So iOS/Android only. Old IDs still work for the moment though.
I don't think anyone really expects a new government from either side to spend political capital on one, especially given the focus on cost of living/inflation at the moment. (There's a federal election in just over 2 weeks time.)