Evolutionary programming. Very suited to goals and agentic stuff. I'd be surprised if it's not yet in production somewhere.

Procedurally generated content is also a lot more interesting. Without structure, you get slop.

You can set the beginning of a story and an ending, as well as a story contour. Then procedurally generate content that ends at these points, even if they seem to veer away.

Metaprogramming for similar reasons, things like writing scripts/languages for very specific problems.

There's good techniques for all these, but the ROI was too low compared to the returns. It was difficult to write tests for the output space, but now it's a lot simpler.