I'm going to disagree here - a little. One of the things a gunsmith will do in a trigger job is to set the sear angle, and fit it to the hammer hook. The parts will wear together some with use, but that's not the same as having the proper angle on the sear. And that angle is critical to the pull weight. It takes a sear fixture, a hammer/sear fixture, the proper files, and know how to do it. Additionally some hammer hooks have what amounts to a speed bump along the edge, and that bump isn't going to wear off. They get better with use, but they don't turn themselves into tuned triggers.It is nothing more that "deliberate-excelerated-wear"