We had requests to remove the email address from the user profile page, e.g. here Access to users' detail · Issue #428 · yunity/karrot-frontend · GitHub
Back then, we didn’t have conversations, so emails were the only way to reach out to your group members. This changed, so I would be tempted to remove emails from the profile page and treat them as authentication detail (e.g. only necessary for sign up and password reset, but not visible for other purposes).
A question to Karrot users: Would you have resistance against removing the addresses?