The sole requirement being that they must deliver and pick up first class mail from every address in the USA 4 times per week.
What you require as a commitment will never happen. FedEx and UPS finish a number of their deliveries via the USPS in areas that are ‘too’ expensive to serve.
USPS has univeral rate that totally funds salaries, retirement, health ins., buildings, equipment, etc., from postal sales. Only thing directly funded by Congress is services for the blind. USPS has overpaid to OPM over $85,000,000,000 for future retirees. This fact is recognized but gov’t still wants to collect again this year from USPS.
USPS is hamstrung by Congress and Postal Commission in it’s quest to remain competitive. Unions are a bane to the USPS but they came about because of woeful abuse of power and abuse of the workforce, prior to strike during Nixon’s Presidency. Not perfect or even close but not funded by taxpayer dollars as many claim. Main complaint is laziness on part of management to do the job for which they were hired. But then the USPS does promote from within and seldom is anyone held accountable.