Are you confident that the American healthcare system wouldn’t declare experts to be a redundancy and simply replace them with the AI?

Yes.

Nothing about this tool replaces experts any more than a calculator or computer can replace a human mathematician.

I would love to live in a utopia where AI can be used ethically, but it is dangerous to promote the assumption that it magically just will be.

I don't assume that AI will always be used ethically (see: War, LLM propaganda bots, etc). Like every technology it is possible to do bad things with it and it will require regulations and laws addressing this.

Dismissing a technology because it is used by bad people, if you actually applied that standard consistently in your life, would have you living naked in a cave without access to fire or tools.

You don't need to believe in a utopia to understand that a world where 70% of pancreatic cancer is detected 3 years earlier is better than one where 30% of pancreatic cancer is detected 3 years earlier.