The only reason that the mechanical broadheads were even invented was because bow-hunters often have bow tuning issues and/or arrow tuning issues and/or shooting form shortfalls that will send even an arrow with the best fixed blade design spiraling through the air in an unpredictable direction. In order to fix those basic set-up and form problems, inventors decided to eliminate the planing features on the broadhead. That doesn't mean that the tuning problems or the shooting form have been cured, it only means that a band-aid has been applied that masks those problems. However, for many that does the trick and does eliminate some of the inconsistancies. I guess whatever it takes to get the job done is what you have to do. For a lot of people, mechanicals have made the difference between a kill and a wound. I guess it is just one more potential variable that is put under control. For myself, I do spend hours practicing form perfection, and bow tuning, and have had pretty good luck with fixed blade heads.