Mail about to get a lot slower.

IF the USPS was actually smart, they'd focus their efforts on areas where FedEx and UPS are weak. That's what smart businesses do. But no, this is the USPS.

I am a former (very former) USPS worker and I can tell you even 25 years ago that organization was filled with so much stupidity, politics, and lack of common sense that it's a wonder they're even still around at all.
I'm certain in saying that if they weren't funded by the US government, they wouldn't exist any more.
Many years ago, I worked for UPS for about 5 years. They were trying to work out the legal hurdles get into normal letter delivery, but the government blocked them from it, and still does.