Mail delivery vehicles have to travel roughly the same paths as long as there is most anything to deliver.

That's what makes it a public service.

Junk mail just makes stamps cheaper. That route had to be driven anyway. You have generally what amounts to a right to put a stamped letter in your box at the end of the driveway, put up the flag, and get serviced. The route has to be driven regardless.

We could eliminate all marketing mail, make a large push to make all billing digital, and USPS would still have to drive most routes most days.

A fix would have to reduce service significantly, or introduce a new "Register for pickup" process to signal your need of service.

We could have also made those brand new mail vehicles hybrid or something.