I think there are also implications for governments and states. Imagine when all this is done without human involvement, you want to have your legislation machine and AI ready to remove all the friction. In the future, states who are getting that will have a big advantage. Today, everything is designed to interact with humans, and even governments need to rethink that.

Not sure for accountants due to regulations esp in corporate finance, lots of things that only a CPA can do etc. Tax preparers sure but not when it comes to complex tax situations. The reason you pay an accountant to do your taxes is because you trust them to do the right thing and have accountablity (pardon the pun). An AI system doesn't exude the same form of trust imo. For most easy tax filing (still a massive population/market), I guess AI can work.

It seems like the best way the humans could compete is to be a bit more flexible on interpretations than a fully compliant AI would be allowed to be. This applies all the way from small to very large businesses.

AI for this stuff is sort of a double edged sword; eventually it'll be forced to be legible in ways that you can't force a human mind to be. There are lots of domains where in theory AI would be great, but in practice everyone actually wants a certain amount of ambiguity and confusion to exist.