For example, why build a new feature that is not part of a split-test experiment? It may save you time in the short run, but it will take more time later to test, during the validation phase. The same logic applies to a story that an engineer doesn’t understand. Under the old system, he or she would just build it and find out later what it was for. In the new system, that behavior is clearly counterproductive: without a clear hypothesis, how can a story ever be validated?
