Do you believe in Murphy's Law?
Even when you're well prepared with the best equipment,stuff happens. When it hits the fan,and your life is on the line, you do not want to stake your life on equipment that is less than 100% reliable.
If you're willing to stake your life on it,how about your wife or kids? Your choice.
Ever been to the range when even your always gun went "click?" because the ammo you used had a hard primer? and your firing pin didn't quite set it off?