In my experience, the majority of forms on the web don't commit until you decide to submit, so if you have an accident before then, you can recover (well, buy a sense of certainty at the cost of redoing some work) by reloading the form. In contrast to that majority, here we're talking specifically about forms where each component auto-submits immediately. I think that if a component auto-submits, then anything related to that submission (success/failure status, undo, etc.) should be presented within that very component.