I had a fiberglass L-88 hood on my Camaro. It bolted to the hinges and had pins in the front. One night someone stole the pins. I even had oil and temp gauges under the cowl vent. On the way to work that morning, the hood flew off, did a few summersaults and landed in the road. All the while hot oil was splashing onto my windshield and through the sunroof. Luckily there was only a small dent in the roof, but I had to make the hood a pin-on after that.
Pins are insurance that your investment does not get wrecked (hood, cowl, windshield, roof, possibly more. They are totally up to you.