We had proved whether it did each of these things and knew exactly by how much. But once we’d learned what we needed to learn, the usefulness of the test fell to zero for us. Unfortunately, the cost stayed the same. And each new feature we added on to the service had to then work flawlessly with the old ones, so as to accommodate all our customers, no matter which plan they were on. Doing so meant that design got complicated. Testing got harder. And everything slowed down.
