Do I need to put you two in time out?
A scale helps, especially when you're new to keeping snakes. Underfeeding is a major issue in this hobby. Do you have to have scale to successfully keep a ball python? No. Do I rely on mine 100% and weigh every meal? Nope, but it helps sometimes and those new to keeping them might not know exactly how big of a meal is best and a scale helps teach them. People also like to keep track of their snake's growth.