Too Long; Didn't Read
The biggest success of a software development team is the positive feedback from end-users who managed to solve some of their problems with your application. The fewer bugs users spot in the application, the higher is the trust for the company released it. And if the product functions as planned, that is the real success of the team and the whole company that worked it it it did. The earlier we start testing the product and its development processes, the more polished it appears in front of the end users.