No doubt that a properly tuned bow and the correct spined arrow setup and good arrow flight is very very critical. Here is my point, if a guy shoots a moderate weight arrow, say a 340 spine 8.5ish-9 gpi with the cheap ass aluminum insert that comes with the arrow and a 100-125 gr broadhead, its very doable to get that arrow to fly very well but it doesnt make it strong and with a hard impact something is going to give. So adding a footer or ss insert or half out.....can be beneficial to strengthening the arrow without sacrificing arrow flight, again as long as it is the correct arrow and tuned properly. I am by no means condoning chasing FOC or suggesting that an add on will replace good tuning or shooting form.