Why do scholars treat Occam’s razor as a guiding heuristic rather than an absolute rule?

Scholars treat Occam’s razor—the principle attributed to the English philosopher William of Ockham that "plurality should not be posited without necessity"—as a guiding heuristic rather than an absolute rule because its application is often subjective and can lead to errors if prioritized over accuracy.123

The principle is considered contentious for several reasons:

• Interpretive Flexibility: Simplicity can be defined in multiple ways, such as syntactic elegance (fewer assumptions) or ontological parsimony (fewer entities). Because these definitions can justify competing theories, the razor can lack the consistency required for an absolute truth.2
• Risk of Inaccuracy: Prioritizing simplicity can lead to the sacrifice of factual accuracy. In fields like medicine or theoretical physics, oversimplifying complex phenomena—such as misdiagnosing rare conditions or ignoring the nuances of natural systems—can have serious consequences.2
• Contextual Limitations: While the razor is a useful tool for developing elegant explanations, it does not guarantee that a simpler theory is correct. It is best utilized as a starting point for inquiry rather than a definitive arbiter of reality.2