In my opinion the only reason to use field tips is for safety and to not destroy targets so easily. If everyone tuned their bow for fixed blade broadheads and had to shoot such a setup in all conditons of wind, rain, twigs and other mitigating circumstances, we'd all be much better at designing better set-ups for hunting.

Target shooting with field tips does not prepare oneself for the special requirement of hunting with broadheads. In many respects it's a detriment. It encourages people to use arrows that are far too light, with way too little FOC and poorly tuned for ideal flight.