Seniority means everything at the Post Office. The individuals have been around awhile, tend to slack off. Once you get through your 90 day trial period it is next to impossible to get let go. So your co-workers get lazy.
It's hard to be overly critical but managers really do make a difference some have the means to make things better and others simply go out of their way to make few changes to look good on paper while ruining everyone's life. In my personal experience there was little to no communication between the management team at my particular office. I feel that a lot of problems at my office could have been resolved by the little more attention to detail a little better communication skills and a few of the managers could learn some personal skills like how to deal with other employees and customers