In my project, I made all of the objects have variables so it would be easier for me to be able to change distances easily so you don't have to continuously changing it, which would be very hard. Also variables could help you go forward or backward, or even anywhere easily. Without variables there would be a lot of things online that wouldn't work. For example, big games like Fortnite, so variables are super helpful, because of variables, it makes a lot of things easier.
