The goal of TDD is not to have tests, or a huge test coverage. Those are just important side-effects. One goal, ignoring how it improves focus and divides compl

The goal of TDD is not to have tests, or a huge test coverage. Those are just important side-effects. One goal, ignoring how it improves focus and divides complexity up nicely, is to make cleaner code. If your code respects the single-responsibility-principle, is not duplicated, and doesn't have dependency issues, you can adjust the requirements faster. The test suite allows you to be confident your changes to some parts of the system don't break others. You can keep more code, not even having to touch many parts of the system. You know that by changing x, you don't also have to change w, y and z. Of course code still must change, but its vastly simpler and quicker to change. Now, that doesn't mean you can't have those benefits without TDD, it's just much easier and clear.