Comparing the robotic hand that holds a ball to the one that holds an apple as a simple specialization is like saying that a stock management system capable of tracking standard-sized boxes can simply be improved to handle irregularly shaped objects like fresh vegetables.
The real challenge is not in specialization but in the system's ability to adapt to unexpected situations.
A ball is a predictable object, whereas an apple can have bumps or weak points, requiring sensors and much more sophisticated algorithms to adjust force in real-time, thus avoiding crushing the fruit.