The theme of the last four years of Federal government has been dismantling working-but-flawed systems in favor of private enterprise. You cannot assume "good intentions" on the part of a Postmaster General who is part of this government and is personally invested in private competitors to the USPS.

The USPS also labors under the Republican-inflicted 2006 decree to prefund their pension obligations: https://www.gao.gov/assets/660/650511.pdf