A system of checks and balances also costs orders of magnitude more money.
this is my fear regarding AI - it doesn't have to be as good as humans, it just has to be cheaper and it will get implemented in business processes. overall quality of service will degrade while profit margins increase.
You probably also need that for the AI as well though
The point was that for many tasks, AI has similar failure rates compared to humans while being significantly cheaper. The ability for human error rates to be reduced by spending even more money just isn't all that relevant.
Even if you had to implement checks and balances for AI systems, you'd still come away having spent way less money.