How do you track users acceptance of your website terms? Do you know when they accepted? Can you prove it?
Who changed the password? What was my original email address? When was my account disabled? Who-done-it?
Profile History to the rescue. All profile changes cataloged - without exception. Use this to comply with the EU GDPR which required sites to notify users of profile changes or face administrative fines (goes into effect 25 May 2018).