In FieldService the Activity Actions section updates already closed, canceled or completed activitie

Does anyone use the Activity Actions in FieldService?  I can see the benefit of using this feature when wanting to close or complete several open activities at once but the problem is that it will update ALL activities no matter there status.  To me it should ignore activities already in closed, canceled or completed activities.  What are your thoughts?  The PeopleBooks doesn't really say one way or another.  Here's what's in PeopleBooks.

Activity Actions

This section is collapsed upon entry to the page. It is used to apply changes to all activities at once. If there is only one activity on the service order, then this section does not appear.