There was a time that I had to think about uncocking the left wrist, but it was only because I had been taught that lag was created by holding on for dear life. I had, originally, a bad concept.
I think that there are a lot of people who have this "bad concept", myself included, in an effort to prevent throwaway. I think that it prevails because it makes almost logical sense ("If I hang on to that angle, then I won't throw it away!"). That's what makes quality instruction so important!