British Commonwealth, now known as the Commonwealth of Nations, is just a gathering of former British Empire Colonies massaging British’s ego. British is not a superpower in the world or even in Europe, and at the Commonwealth is where they can pretend to shine.
So QEII invites the Heads of States of the 53 countries for a photo-op at Buckingham Palace, they are all so mesmerized to be “close” to their former colonizers; and they all agreed to have Prince Charles as the next Head of the Commonwealth. They should not have consented, this position is not hereditary.
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It was tehir choice to keep him as next Head of the Commonweatlh. AND it was supposed to be Meg and Harry's special area, as royals.