Right. But that's not the only reason to write tests, and presumably if your tests were giving you false positives, you'd want to note and address that. If "are my tests telling me when my software fails?" is a valid question to ask oneself, surely so is "are my tests telling me when my design is flawed?"

Of course, you might not believe that design feedback is an important motivation for writing tests, which is absolutely fine, but then the issue isn't that the OP is "focusing too much on process and methods" - he simply has different processes and methods to you.