It makes hiring new people very expensive. I'd imagine one of the goals of such legislation was to reduce the bloat within USPS - ie. let go of unproductive em

It makes hiring new people very expensive. I'd imagine one of the goals of such legislation was to reduce the bloat within USPS - ie. let go of unproductive employees and replace them with productive employees, or just remove dead weight completely. Instead, USPS is basically a job's program. "Nobody ever got fired from USPS", is probably not very far off from the truth.