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Also seems like the AI is just taking advantage of over-engineered systems with unused capacity/safety margins. Why can the system handle that colder water? I'd expect condensation, even ice, if the chilled water was below expectations. How much of this improvement is really just the AI making changes that the humans would not normally be allowed to make? How much is just that the AI is allowed that little bit closer to the edge than we allow the humans?

I wonder the same.... AI is good for making use of unstructured information, but for structured numerical information from sensors, an advanced optimal control algorithm like MPC will likely perform as well or better.

Plus MPC isn't a black box, and so is amenable to characterization, interpretation and analysis. It also has robustness-enhancing features that have been developed over decades, so the fallbacks are known.

Yes, I believe it is more complex than that. This statement is used to exemplify the learning capability of the system, which is understandable for non-technical users.