So the problem with USPS is that it is written into law that they are not allowed to be profitable/ take profit. Crazy I know. So the reason they're always in trouble is because they never have extra money behind them to help in hard times. Trump was supposed to fix that. They brokered this deal with Amazon all while not making a profit and as you say, clogging the system.
Sean I'm sure Santa will drop your orders off today. Very rarely will it say "out for delivery" and not be on a truck, actually never. Now keep an eye on that because it can still be delivered to wrong address and getting a call in to the PO right away when this happens will be your only saving grace.