Actually the board may not have acted in most professional way but in due process they kind of proved Sam Altman is unfireable for sure, even if they didn't intend to.
They did notify everyone. They did it after firing which is within their rights. They may also choose to stay silent if there is legitimate reason for it such as making the reasons known may harm the organization even more. This is speculation obviously.
In any case they didn't omit doing anything they need to and they didn't exercise a power they didn't have. The end result is that the board they choose will be impotent at the moment, for sure.
They did notify everyone. They did it after firing which is within their rights. They may also choose to stay silent if there is legitimate reason for it such as making the reasons known may harm the organization even more. This is speculation obviously.
In any case they didn't omit doing anything they need to and they didn't exercise a power they didn't have. The end result is that the board they choose will be impotent at the moment, for sure.