See PHI1063. See PHI1114. Ref T13253. Currently, you can't bin/worker execute an archived task and can't bin/worker retry a successful task.
Although it's good not to do these things by default (particularly, retrying a successful task will double its effects), there are plenty of cases where you want to re-run something for testing/development/debugging and don't care that the effect will repeat (you're in a dev environment, the effect doesn't matter, etc).