Postmaster Dejoy began dismantling critical sorting machines, reducing and limiting overtime, &c only 6 months into lockdown, well before there was a COVID vaccine. Knowing full well the problems it would cause. For example, many remote rural addresses are only serviced by USPS, and people rely on it for timely prescriptions. IMO it was massive public outcry that prevented a great deal more destruction.
https://www.vox.com/2020/8/18/21374014/post-office-usps-loui...