A very common misconception in many organizations is that creating a special position means getting something special done: a confusion of role with function. Clearly role and function are not the same. A principal who picks up a piece of trash does not thereby become the janitor. But not everything, if anything, a principal does is some special kind of “principal-activity” that couldn’t be done by anyone else.
Public school systems tend to be top-heavy with administrator roles whose functions could often be better served by distributing them among staff closer to the arena of action. Only political taboos would be violated.
To examine these issues further, see
On the Viability of a Curriculum Leadership Role: avoiding confusion of role and function