Why is it that a single all encompassing metric can not be develope for program complexity and program quality?

A single all-encompassing metric for program complexity and quality is challenging to develop because both concepts are multifaceted and context-dependent. Complexity can arise from various factors like code structure, algorithms, and dependencies, while quality encompasses aspects such as maintainability, performance, and security. Different programming languages, frameworks, and project requirements further complicate the issue, as what may signify quality or complexity in one context might not apply in another. Consequently, a holistic measure would oversimplify these intricate dimensions, potentially leading to misleading assessments.