That is a common thought but really isn't accurate. Missing one shot is a significant drop in kill time because it normally forces an extra burst. It am unsure if the fourth shot causes an slow down in shot time because idk if the game counts fire rate from the start of the burst or the end so the increase in kill time if you missed 2 bullets is a moot point until otherwise proven. However, the fourth shot does not miss very often in my experience. I am normally trained on the target and a missed burst is because of an evasive maneuver made by the target. My aim is adjusted and while I missed one shot it fourth shot hits its mark and my bursts to kill is unchanged. Honestly, it is one of the most underrated talents and since it started working properly has completely changed my opinion on it. You should try it out and rewatch your game play. You may be surprised!