Yeah, the USPS. isn’t the best government system but it’s in the Constitution and it would take an Amendment to eliminate it. Never going to happen.
Completely defund USPS and keep one office open in Washington DC to meet the Constitutional mandate. Problem solved.
I don’t see a Constitutional mandate for a US post office.
My reading of the Constitution says that “ Congress shall have the power to establish Post Offices and post roads.”
That Congress has such power does not mean Congress has to weild it. They are free to dismantle it as they see fit.