It is good PR to have what is largely ceremonial role that oversees an entire system, whose powers are in practice useless or completely defanged.

I’m thinking of the role of the King or Queen of England, for example, or any country’s president. They have the power to disband parliament if it is deemed unfit for government, or reject a law that has been approved by the senate/Lords, yet in practice they are not expected to disagree with the ‘will of the people’ so to speak.

Same applies to the head of an ethics department on a business which is obviously unethical (or they wouldn’t need one).