Ikhtiṣār is effective concision: the intended meaning remains intact while unnecessary extension is removed. Its value cannot be determined merely by counting words.
If a longer construction expresses a quality indirectly and the revision conveys that same quality more clearly with fewer words, the concision may deserve praise. But suppressing an essential qualification can distort the original thought.
The test of good concision is whether intent, semantic fitness and expressive force survive the reduction.