why hotwire a fuel pump?

The stock setup does not deliver enough voltage. Although the term sounds "mickey mouse", it is not......it's a kit made by Casper Electronics that is easy to install..

You can get the kit through many GN parts distributors (Kirban Performance etc). Provides more fuel volume and helps to prevent detonation....;)
The stock wiring setup robs to much voltage by the time its gets to the pump. A hotwire kit will supply the neccesary voltage to maximize the pumps fuel volume supply.