CSS preprocessors like Sass and Less provide advantages such as variables, nesting, and mixins, which make stylesheets more maintainable and scalable. They also offer features like functions, inheritance, and modularization. However, using preprocessors can add complexity to the build process, require a learning curve, and create a dependency on specific tools.
Moreover, CSS preprocessors can lead to more CSS code being generated than necessary, potentially affecting performance. Additionally, the use of preprocessors may require additional setup and configuration, and could lead to conflicts and inconsistencies if not used consistently across a project or team.
