He tried to get them to mainly use gas powered hybrid ones. Which sounds great on the surface, but they basically got the same mpg as the now at least 30 year old LLVs they were replacing, just with AC. When that fact was put out, these fully electric ones genuinely just made way more sense for most postal routes. They took a long time to develop, but that’s because the usps had a long list of stuff they wanted to accommodate (sounds crazy, but they seem to have actually taken a lot of feedback from the drivers).
He also got rid of a lot of the automated letter sorting, most likely to slow mail-in voting. A lot of those sorter couldn’t easily be replaced, as they were expensive machines.
The main reason you seem to have been down voted soo much is because you said that Dejoy was the cause of the recent improvements in the postal system. While he was over the USPS during the changes, it’s pretty obvious that he’s not the reason for them. $22hr is decent, but it really does depend on where you live, and they do have deliver a lot of packages, so it’s not an amazingly cushy job (I think a UPS driver is paid like ~$30hr in my area, although you could argue they are moving more packages on avg).