Comment by galaxyLogic

The way I would approach writing specs and requirements as code would be to write a set of unit-tests against a set of abstract classes used as arguments of such unit-tests. Then let someone else maybe AI write the implementation as a set of concrete classes and then verify that those unit-tests pass.

I'm not sure how well that would work in practice, nor why such an approach is not used more often than it is. But yes the point is that then some humans would have to write such tests as code to pass to the AI to implement. So we would still need human coders to write those unit-tests/specs. Only humans can tell AI what humans want it to do.