When one runs isn't it easier to move along with the least stuff possible? The more I look at pictures of people running even the shortest of races they seem to be carrying all kinds of stuff. It must be like going on vacation and packing two times what you need. People seem to be wearing hundreds of dollars of special clothing, shoes, and aids for races of a half hour. What gives?
I don't like carrying anything if I don't have to...it is just more to manage. You carry too much stuff sometimes you feel obligated to use it, drink it, eat it, whatever. Isn't the purpose of training is seeing what you require as a necessity? Maybe all these aids help people think it will get them through the tough times. Training gets you through the tough times. Know where the water is, have a few electrolytes, and grab a bit of grub along the way. You can go a long way on that...if you train for it.