فإن كان خالي الذهن من الحكم والتردد فيه استغنى عن مؤكدات الحكم
If the hearer neither knows nor doubts the judgment, expressions reinforcing that judgment can be dispensed with.
This is the ibtidāʾī mode. For instance, “الطَّالِبُ نَاجِحٌ” — The student has succeeded. A hearer simply waiting for the result normally needs no emphatic assertion.
The principle is about appropriateness to an audience, not a claim that every unmarked nominal sentence must always remain unemphatic in every context.