The world isn’t deterministic and there isn’t just one human you have to test against.

What works for one, kills another.

Just look at what peanuts can do. If your tests don‘t take something like this into account, you get in trouble. And there are lots of those things to test against, known and even unknown.

And then there is evolution. What works today, doesn’t work tomorrow.

Or things like this happen

https://www.wgbh.org/tv-shows/reactions/how-an-hiv-miracle-d...

And of course there is the profit thing, that creates problems to give everyone the treatment they need.

AI can help prevent defeat but there is no winning