- head: shift left so that you can find issues sooner at PR level vs at deploy level - wallet: you can do combined e2e and unit test coverage on the same repo https://dev.to/muratkeremozcan/triple-combined-code-coverage-for-react-apps-with-jest-cypress-component-and-e2e-tests-using-github-actions-1icc - emotions: you can have component tests while on the same repo, and who doesn't want the latest and greatest feature set?