Earlier quoted context omitted.
The managers are just following the (fairly absurd imo), amazon internal processes for the most part. If the processes don't change, there are just going to be a bunch of overloaded managers. The current processes, culture, and 'principles'/dogmas are inefficient, contradictory and toxic af.
Who created the policies and procedures?
According to TFA they have about 106000 managers before this layoff. You don't give 106k people any meaningful control over the company's policies and procedures, that has to come from the layers above the managers, probably several layers up.