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I'm almost certain the designs of the Klingons changed in Discovery because they don't want to risk accusations of blackface.
before:
>brown facepaint on anyone playing a Klingon, be they black or white
now:
>a full rubber mask rather than paint, that's straight-up black, or straight-up white, or bluish rather than a shade of brown
the mask was so limiting none of them could emote or even speak properly.