Here's why:
* Dumbledore's power is his knowledge and skill: His strength lies in his vast understanding of magic, his strategic thinking, and his experience. These things can't be passed on like a physical object.
* He leaves a legacy, not a power: Dumbledore's influence lives on through the people he taught and the actions he inspired. His actions and teachings guide Harry and others in their fight against Voldemort.
* Power is earned, not inherited: The wizarding world, particularly in the Harry Potter universe, values earned power, not inherited abilities. Dumbledore's legacy encourages Harry and other wizards to develop their own skills and contribute to the fight for good.
While Dumbledore leaves behind a legacy of wisdom and courage, the notion of him directly transferring his powers is not a part of the Harry Potter story.