Boards are useless. They are either friends of executives, former owners of entities that were acquired, or folks that have special interests with the organization. There is very little independence.
The voting and selection process is not scrutinized. The board members may not even have any experience or knowledge in the company being served.
No board member has ever prevented any fraud, poor management decision, or collapse. If executives resign or are fired, it is mostly related to stock price and the cause of its decline.
They usually attend the boad meetings every quarter and collect their hefty salary. Total sham at the shareholder's expense.