Your experience certainly doesn't match my experience; I've worked with brilliant QA people who were able to diagnose problems both when deviating from spec and when performance is a feature that isn't being properly met. And when someone has not been up to snuff, in almost every case I've been able to teach the people you arrogantly dismiss as "noise" and make them better able to help us all create better things through that education.

Your attitude, however, does match my experience: it is why people think software people are assholes. So be more mindful, please, from up there on your high, high horse. For yourself and for us as a profession and a craft.