After you have migrated service accounts to roles in Active Directory, tested operations, and verified that commands and jobs run as expected, you can remove the local service accounts from remote computers to prevent them from being used.
For most organizations, removing local service accounts is a recommended security practice. However, you should leave the default operating system accounts as local accounts. In most cases, those accounts are not migrated to Active Directory. The default accounts for each platform are listed in the user.ignore file that is installed with the platform-specific Centrify Agent.