For me, the message is more than a notification what trust level I have. Therefore, a notification like for all other badges would be enough. But this message is the chance for the staff to tell you about for example new privileges and responsibilities. This message can be customized, so it can be different from the one you got at another discourse forum. It would be a bad idea if users could disable that. Maybe think about it more like other messages from staff, you cannot choose to not receive messages from staff in general.
There is a difference between an admin choosing that this message is not needed in a community and a user deciding they do not need a message, without knowing what it will say.
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