I read just last week where they found a mailman that had a couple thousand articles that were supposed to be delivered in his garage dating back for years.
Ho-Hummmm ... I worked for 6 hrs, so I guess I'm done for the day.
I remember that story and there have been a few others like it in the past.
Possibly the root cause of the problems is the compensation going from hourly rate to a salary type. I don' know what the current compensation package is, but I can recall when it was one of the highest paid jobs and there were waiting lists for applicants that were miles long. You had no chance of getting a USPS job unless you were a veteran, preferably a minority, disabled and female. But the USPS was a government agency then , not a for profit corporation.
My wife is a fan of the post office. She will often say "what other service can you puut a letter in the mail box, with a $.50 stamp on it and have it delivered into someone's hands 2,000 miles away three days later". When I worked in engineering, we had the rule of threes, "good, fast, cheap, pick any two, you can't have all three". If postal rates were to go up to $2.00 letter, there would be a lot of griping. The fact that FedEx,and UPS have partnered with the USPS is an tacit admission that the USPS can do final delivery more efficiently than any other service. On the other hand, USPS contracts with third party carriers to move packages long distance.
I feel for those who are experiencing poor service. As I said previously, I am fortunate that I don't. But don't judge the whole basket by a few bad apples.