Discourse may be grammatically well-formed and free of defects of fasaha but still fail to satisfy the situation's demands.
CriterionMain question
GrammarIs the construction syntactically correct?
FasahaIs the wording free from recognized defects?
BalaghaIs this expression suited to this occasion?
These are related but distinct tests. A syntactic mistake is not redeemed merely by good intentions; an impeccably grammatical sentence does not become rhetorically excellent in every possible context.