It would be extremely helpful if you could see which account user was performing actions. Who created a campaign, who added a contact, who edited a contact, etc.
For accounts with multiple users logging in, we need to be able to see who is making which changes. Almost for quality control.
Example - A contact is added to 'All Office' list, however they should not be on that list. Management needs to be able to track the user down, that added this contact, to see why the contact was added to the wrong list.
It's great we now have the ability to add different user roles; however this 'activity tracking' or 'multi-user setup' has been requested since 2013 on various threads.