Because a machine is expected to do it right the first time.

No, it’s not. And it doesn’t have to because as I pointed out it can check its work.

You’ve got a mistaken impression of how AI works, and how machines in general work. They can make mistakes and can recognize and correct those mistakes. I’m a programmer, I have plenty of first hand experience. I’ve written code that does it myself.

So if a machine is to take over that job, it better do it right and reliable and cheaper.

Yes, that’s the plan.