Civil Service used to be lower pay but secure. Retirement was not as good as private, if you could hold on to a company job long enough to collect.
Now government jobs pay more than the private, have fixed benefit programs and health care. Equality is fine, but it has been declining in the private sector. The Post Office has been cutting workers when they should be cutting pay, benefits, to match the people they serve.
Also, Government is the problem with bulk mail rates set so Capital One can send me a new offer every few days. My route carrier is overloaded with non mail advertising. I do not open or recycle, it goes in the garbage can next to the mail box. Those bulk rates are like tax reductions for the rich, they just put the load on some other part of the system.
DHL did not replace the route carriers, or the Post Offices, they just charge for services. Bulk mail is most of the labor and none of the profit.
Also Post Offices do act as a Passport Office, and in Germany, Social Security, Banking, Motor Vehicles, which reduces other public costs.
Under the English system, Savings Bonds, with a part of the interest going into a pool, where bond numbers are picked, and many small lottery prizes are paid out. It gets people saving, which funds government, and produces a player paid national lottery.
I will take a Postal Money Order, but not Western Union and forget any other. Would it be that hard to cut a deal with Paypal? How about the bank to bank transfer used in Europe? Dealing with Europe was hard, as most did not take Paypal till recently.
The Post Office has offices, people I know, it could offer more services.
I once tried to ship a gas cap made in Austria fifty years ago to Canada via UPS. I gave up, went to the Post Office, no problem. UPS treated it like international cargo, I became an importer and exporter, way too much paperwork. Flat Rate Priority Mail works worldwide. Free boxes!
The Post Office could work, if it was a business. It has been regulated out of the profitable sectors by Congress. They also have some cool stamps.