Quoted from curiusgeorge:

Lol. Packages and letters are processed seperately. Regardless of how busy one or the other is, they both have to be processed daily. "Junk" mail or standard mail is processed with first class letters and sent out for delivery.
Also, what you call junk mail is paid mail from advertisers that get a reduced rate because of their volume, and also helps keep the cost of your letters you mail cheaper.
Comparing Amazon Fedex and UPS to USPS is comparing apples to oranges. USPS delivers daily to virtually every address in the country. The other three dump the packages they deem too far out of their delivery zone on USPS. They also only have to deal with packages. No magazines, letters, or newspapers.
And yes, I do work for USPS.

Quoted from Lermods:

You should knock on wood and consider yourself lucky. USPS had been nothing short of atrocious, there is no accountability and you wait an hour plus on the phone if you might ever need to contact them. We have packages mailed by us and to us from early December that still have not arrived. Here’s a nice gem. I’m sensitive to COVID and volume issues, but they shouldn’t charge or even offer priority rates if it’s going to take 10-20 days.
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Quoted from Lermods:

That’s right and it just one example.

I have packages sent to us and by us since early December, still waiting so now it’s over 20 days. And btw, that tracking history I posted, still unchanged so now we are on 14 days for something that normally takes 3-5 days.
There are some really notorious places in the USPS system, such as Boulder, Co, Kearny, NJ, Joliet, Il...I’m sure you all have your favorites.