I have a very surface level understanding of AI, and yet this always seemed obvious to me. It's almost a fundamental law of the universe that complexity of any kind has a long tail. So you can get AI to faithfully replicate 90% of a particular domain skill. That's phenomenal, and by itself can yield value for companies. But the journey from 90%-100% is going to be a very difficult march.

The nines comment was in the context of self driving cars which I can see because you are never perfect driving and accidents can be fatal.

Some AI is like chess though, where they steadily advance in ELO ranking.

The last mile problem is inescapable!