During the Christmas rush Amazon stopped delivering to your home as usual. They would use USPS where I live. And USPS would not deliver either. You had to go to the Post Office.
The line of customers lining up to get their packages was terrible. Waits of 30-45 minutes were normal.
There were only two Amazon lockers nearby. If your package was too big, forget it. It went to the post office.
My U.S. mail lady gets a nice gift every Christmas, because I’ve never had a problem with mail; and before she came on the job, if anything was returned to the post office, I just had to call and have it redelivered. I know a lot of people have problems with the Post Office, and it could be different in different areas, but I’ve never had a problem with the U.S. Mail.
(FedEx is another story...)
Pay your bills early during the holidays. Companies will claim it’s the post office’s fault if you get a late charge. Lie. When other payments arrive in plenty of time, then that’s proof, imo, companies are gouging customers with plausible excuses. Funny how it’s always the same company and other customers get the same story.