As a form of testing I think there are two main reasons: 1. If we need to push this feature now, some say, reliability and future modifiability only get in the

As a form of testing I think there are two main reasons: 1. If we need to push this feature now, some say, reliability and future modifiability only get in the way. Under pressure people tend to focus on mere survival. 2. Developers don't know how to test properly. Namely, they don't know which tests to write and which not. That leads to excess of work, all while many errors (bugs) still find their way into the software. Naturaly, testing seems like a bad investment.