Astyanax I'm not surprised he stayed on as long as he has and didn't decide to quit long ago. No one's really tried to fire him because I don't think anyone's crazy enough to want his job.
He also said he has to deal with such an ingrained bureaucracy there that it would be easier to just build a new postal system from scratch than trying to fix this current one.
I don't like him but I agree with many of your points.
One basic need is AT A MINIMUM to stop routine Saturday delivery, as Canada did long ago.
With 5-day instead of 6-day delivery, it would greatly reduce the need for "floaters" and make the whole system more efficient (the "floaters" can't possibly know the routes as well as each regular carrier) and it would cut down on all the Saturday gas abd vehicle use (and salaries of course).
But Congress has always stopped that, due to complaints from mass mailers.
Likewise, although I am NOT in favor of massive numbers of post office closings, there are still MANY scattered about that could be consolidated. Some are downright tiny, and do not provide local delivery but only sell stamps and have some PO boxes.