waiting for deliveries

deliveries can seem to take forever and they don't always have tracking and sometimes even if they do have tracking it isn't very good (doesn't update the details) and honestly I think this is a problem that should be fixed, in such a modern age getting packages shouldn't be such a hassle, I believe that there should be one universal mail delivery service, I know there are some that come close but i think there should be one system instead of countless faulty ones, but I suppose there would be issues with that as well, I guess these thoughts stem from the fact that I hate waiting for packages, but in this day and age where we have "next day delivery" and "overnight shipping" why are there even options that would take longer than a week?