You can kill a deer with a homemade bow, and a sharp stick. All the FOC crap is and spine is the difference between getting all you can with your bow, or just getting some out of your bow.

What kind of damage will a motorcycle do to a building flying a 65 miles an hour do? Or what will a one ton truck do to a building do traveling at 55 miles an hour do.

Yes you can kill deer with under spined un weight arrows, but how good of an archer and how much do you want from you bow... You are the only one that can determine that.

If you don't care, then it's all crap!