Coaches should have a mechanism to lodge a complaint regarding specific rulings - even judgment - or conduct that occur during their games. And, I believe they have a right to know that there is some level of accountability by officials, should a review of the ruling(s) in question show that an error or misconduct was truly made. Depending on the nature, severity and impact of the error or misconduct, that accountability might be something as simple as a notification to the official/crew that an error/misconduct was made, with reference to the correct ruling/conduct that should have been made/used, and a warning that such error/misconduct should not be repeated. The end. If the nature, severity and impact of the error or misconduct justifies greater accountability, then greater measures should be taken, such as required retraining, limitation of assignments, removal from assignments, suspension of activities, or, ultimately, expulsion. The coach should have the right to know of any action taken against an official/crew as a result of his complaint.
But, such accountability should be to the officiating organization. If the organization finds that no true error or misconduct occurred, then the coach (and official/crew) should be duly notified.
But no evaluation by a coach should EVER have any value to an officiating organization. With very, very few exceptions, no coach is qualified to evaluate the performance of officials. (By the same token, very, very few officials are qualified to evaluate the performance of coaches. Only speaking for myself, but I've never evaluated a coach - don't really want to).
The problem is when coaches have the ability to use their subjective opinion regarding an official when making or approving assignments to officiate their games. In those instances, competence and capability have nothing to do with the assignments - only whether they think they can win using that/those official(s), and that is just wrong.
In the NCAA and NFL, only in the rarest of circumstances and with proven justification are officials ever restricted from working at any particular institution/team. Even when an error is made, that official/crew may be seen working that same team only weeks later.
And that's the way it should be.
Coach evaluations are totally worthless.