Two previously established conditions remain fundamental: conformity to the demands of the situation and clarity of indication. Badīʿ improves utterances that meet these requirements; it does not replace them.
A clever contrast that trivializes a solemn occasion is not effective rhetoric. Nor does a difficult verbal pattern become valuable merely because it can be named as a figure. If its structure obscures the intended relation, the ornament defeats the purpose.
Rhetorical excellence comes from harmony among meaning, situation, and form. An embellishment contributes to that harmony rather than substituting for it.