In 4.3, to reassign a workflow, you must first open the currently assigned workflow’s list and unassign the desired area(s), only then can you assign the area(s) to a new workflow. It would be useful to assign a new workflow over an old workflow all in one step without having to first unassign the previous workflow.
While reassigning workflows shouldn’t be a significant part of administration once the workflows have been defined, this feature would still be nice to have.