Monorepos are a popular approach for organizing codebases, but they can lead to slow Continuous Integration (CI) and decreased productivity as the codebase expands. The solution is to draw clear semantic boundaries around components in monorepos to manage complexity. By mapping component boundaries in CI/CD pipeline definitions, teams can ensure that only relevant parts of the codebase are built and tested. Buildkite's Monorepo plugin helps achieve this by allowing pipelines to watch for file or folder changes and run necessary steps based on what changed. This approach leads to faster feedback loops and more efficient standup meetings.