Another case like this: a project is up to date on a preliminary basis, the documents have been published, but now a revision is required. To this end, you want to delete previous comments that are still contained in the nodes.
Normally, you would create (and confirm) a new version by right-clicking on the node, then go to Quick View and delete (and confirm) each comment in the node individually. That’s at least 5 clicks for a single comment. And, it only works for your own comments – you can’t delete comments from colleagues this way (further steps would be required to do this).
With an appropriately configured workflow, you could select the workflow from the node’s context menu, and all comments – not just your own – would then be instantly deleted. Here again, it just takes two clicks to complete the task and get the result you need.