In the fast-paced world of agile software development, efficiency and speed are key factors to success. Regression testing, while a powerful tool, may not always be the most practical solution in such environments. While this form of testing has traditionally been used to identify defects and issues with software, the process can be slow, expensive, and can impede development teams from experimenting with new code on production.

For these reasons, many organizations have shifted their focus towards developing tools and environments that support testing on production. By leveraging tools like canary releases, shadowing traffic, and beta testing, developers can collect sufficient data points to ensure that a release is stable without the need for regression testing. These tools allow for more streamlined and efficient feedback on code changes, enabling engineers to experiment with new code and quickly identify and address any issues that may arise.