[KraftyOne]

That's really interesting! It does seem that this is identically semantically to the library approach (as the logic your interpreter adds around steps could also be added by decorators) but is completely automatic. Which is great if the interpreter always does the right thing, but problematic/overly magical if the interpreter doesn't. For example, if your problem domain has two blocking operations that really form one single step and should be retried together, a library approach lets you express that but an interpreted approach might get it wrong.