In 2006, the Post Office was going to electrify their fleet..

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It was preceded, however, by a virtual waterfall of op-eds and PR efforts by groups affiliated with the Koch network including the Reason Foundation, the National Taxpayer's Union, and the CATO Institute. What the law did was ram a poison pill down the throat of the Post Office. It required the USPS to pre-fund its Retiree Health Benefits Fund for seventy years into the future, forcing the Post Office to take the money they planned to spend on electric vehicles and set it aside for the health benefits of future retirees who weren't even born yet (and should be eligible for Medicare, anyway).

It's an obligation that no other private business or government agency has ever had to comply with before. Costing the Post Office $5 billion a year, it succeeded in stopping their plan to electrify their fleet dead in its tracks. And it set it up more cleanly for eventual privatization, once enough infrastructure like postal drop boxes and million-dollar high-speed sorting machines was destroyed—a process Reagan called "Starve the Beast"—that "customers" were complaining about the service and public opinion finally agreed the Post Office would work better in private hands.

Reagan had tried to do the same thing to Social Security and the IRS, and Trump doubled down on that plan, offering tens of thousands of staffers early retirement to gut both agencies; they're now so hobbled by underfunding and worker shortages that Social Security disability claims can take two years, and extremely wealthy people are no longer generally audited at all because of the cost and manpower needs determined by their complexity. Which brings us to Louis DeJoy. 

The Post Office is finally on the verge of getting out from under that $5 billion-a-year prefunding burden so they can now start buying that new fleet they proposed in 2006. Postmaster General DeJoy was strongly encouraged by the Biden administration to give the contract to a company that would manufacture electric and electric/hybrid vehicles. But DeJoy essentially told Biden to go screw himself: he's going to buy fossil-fuel vehicles for 90% of the fleet instead...

So, now that the possibility of electrifying the nation's (now second) largest fleet of vehicles is pretty much dead and they're planning to go ahead with fossil fuels, Republicans in Congress are fine with eliminating the retirement prefunding dead weight on the Post Office.

The outrageous story about the Postal Service too many know nothing about - Alternet.org

• It would have given the nascent EV industry and charging infrastructure a huge fillip, but then rightwingers intervened and imposed a unique retirement prefunding law upon the Post Office to cripple it financially.
  
• Also showed how they routinely underfund public agencies, preventing them to be successful which foments anti-government ideology.