Letter, A4, Paper size

Is it merely an annoyance, inconvinience, or absolutely stupidity that the U.S. uses a different paper size standard then the rest of the world? How many times I print a document from our other offices and resulting in text on the wrong page, or loosing columns on a spreadsheet? If the U.S. want to get in the global game, how about following the rest of the world and start using International Standard Paper Sizes. While we are at it, how about adopting GSM as the cellular network standard !!