What about the vote taking jobs program?
Without all those workers being employed, they may not vote democrat.
That is the reason.
If you required every letter to be machine sortable with a tracking number, you move to a hub and spoke model, the cost of sending a letter would drop to a fraction of the current price.
It may mean that the local post office is going to be in a rented office in a business park and the mail delivered via standard commercial vehicles, but it will get done as it always has.
Mandating that the post office buy electric cars, trucks, and hybrids didn’t help things.