Vue mixins and directives offer a powerful mechanism for extending Vue applications by enabling the reuse of functionalities across multiple components. Mixins, akin to utility resources, allow developers to share data, methods, and lifecycle components among Vue components, promoting the DRY (Don’t Repeat Yourself) principle by reducing code duplication. They can be implemented locally within individual components or globally for application-wide access, although they may introduce challenges such as naming conflicts and debugging complexities. Directives, on the other hand, are methods that modify template elements and can also be global or local, providing developers with the ability to create custom behaviors like styling changes. While filters offer similar customization by applying text formatting or data filtration, they have been deprecated in Vue 3. Despite the potential drawbacks of using mixins, the article emphasizes their utility in managing complexity within growing applications, allowing for a centralized approach to updating shared functionalities.