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Restrictive lung diseases are characterized by an inability to fully expand the lungs, leading to reduced lung volumes and various other pulmonary complications. One key characteristic of these diseases is the reduced lung compliance, which is the opposite of increased compliance. In restrictive lung diseases, the lung tissue becomes stiff or there is an issue with the pleura or chest wall that limits lung expansion, making it difficult to inhale fully.

Increased lung compliance would indicate that the lungs have become more elastic and easier to expand, which is not consistent with the nature of restrictive lung disorders. Instead, these conditions typically feature low compliance, meaning that the lungs are less able to inflate and hold air, which results in reduced total lung capacity and difficulties with lung expansion during inhalation. Therefore, the identification of increased lung compliance as not characteristic of restrictive lung diseases is accurate, as it directly contrasts with the fundamental properties of these conditions.