One of the main problems I have with the models coding is the feedback loop is way down the chain from generation, it's out at the commit boundary for python when your hooks are running, maybe at the point where the model wants to push a PR. The REPL lets that happen during generation, and the other safety measures help immensely. Immutable data, STM, all of the features in Clojure that gave devs super powers now do the same for a model.