documentation on --update-user-info needs some clarity

[Luci2015]

documentation states:
--update-user-info: causes User Sync to check for changes in first name, last name, or email address of users and make updates to the Adobe information if it does not match the directory information. Specifying this option may increase run time.

Email address update above is misleding, because the email is not always updatable.
For example, in most email based user login setting implementations, user_username_format statement in connector-ldap.yml file is not active (commented or missing).
This is the case when UST creates accounts with equal value for both username and email fields in Admin Console.
In this scenario the use of --update-user-info is useless, since old email is no longer found in LDAP and new email is, resulting as consequence that the old email account is subject to whatever policy the adobe-only-user-action has (preserve, remove, delete, etc..) and new email account gets created; no update

EDIT: udpate of email appears here as well