What are the benefits of reducing dependencies?

Reducing dependencies—i.e., lowering coupling between modules—offers several key benefits. First, it improves testability: isolated units can be mocked or stubbed easily, enabling unit tests that run quickly and deterministically. Second, it enhances maintainability: changes in one component are less likely to ripple through the system, reducing regression risk. Third, it increases flexibility and reusability: loosely coupled modules can be reused in different contexts or swapped out with minimal impact. Fourth, it supports parallel development: teams can work on independent components without waiting for interface changes. Finally, it aligns with SOLID principles, particularly the Dependency Inversion Principle, which encourages high‑level modules to depend on abstractions rather than concrete implementations. Together, these advantages lead to more robust, adaptable, and easier‑to‑understand codebases.