Perhaps we can add a “completed by” line to reflect on the details box? this would be helpful for shared users to know who created and who completes the task rather than digging way down in the time line .

Created by: abc

Created date:

“Completed by:xyz”

I would prefer to see it on the front without having to dig too deep.

Like when you look at the notes section of a contact. It shows completed activities, start date and complete date but not who completed the task.