Make the Rules the Counterparty, Not the Boss
Every shift in the rules moves effort from doing the work to reading the boss. Predictable rules are the cheapest efficiency investment available.
A simple diagnostic: when a boundary case appears, do people first consult the rules or first ask their manager? If it is the latter, the written rules are decoration and the real rule is a superior's momentary preference.
Three conditions make rules real: they are published and queryable; they cover high-frequency decisions rather than exotic ones; and their application leaves a trace, so the same case reaches the same conclusion whoever handles it.