USPS...sigh. They are a quirky group. I may have said this before, but they drop the ball, kinda often. No offense postal workers! It's never easy shelling out dough for a soon to be visible product. In other words handing over your hard earned money, and having to wait is mildly anxiety inducing to begin with. it only adds to the situation. I have been there once before here recently, NOT FUN.
On a serious note though, i don't think people, not you directly, take into consideration the insane amount of parcels, mail that circulate
throughout the country daily. It is a mass orchestrated operation obviously. Takes so many things for it to work, and work well. Everyone has their bad days, things don't happen, people don't come to work, you have to sub another persons route, whatever.
I have a huge fear of running out myself, so i order often, or heavy if i plan on not being able to. Probably have 3 months supply right now. My latest order showed up today, and only yesterday did it update that it had been picked up in Chicago!