Prior to recent changes apparently motivated by T10939, assigning Owners was an easy way to configure 100% code audit for an area of code.
After those changes, any commits by an Owner are bypassing the audit. To get back the old behaviour, it is now necessary to duplicate all the Owners configuration as Herald rules.
This could be made easier if Herald had an Action on commits to "Add Owners as Auditors". The intention of this action would be to unconditionally add Owners as Auditors - even when the author of the change is an owner. With such a rule, a single Herald rule would be all that is needed to restore the old behaviour of raising audits on all changes.