Two equally faṣīḥ utterances may differ considerably in length. It is wrong to equate brevity with balāghah in every case or to treat all expansion as a defect. More detail sometimes completes the purpose; at other times it distracts from it.
Appropriate ījāz states everything necessary with no needless words. Appropriate iṭnāb uses additional material when clarification, emphasis, or effect requires it.
The decisive question is not “How many words?” but “Why is this form of expression suitable here?”.