I have a hypothesis that anyone who is required to be on site without having to do a hands-on thing (e.g. physical maintenance or repair) is actually a garden hermit, that is, hired to perform as an extra for the pleasure of viewing upper management.

They're Type 1 Bullshit Jobs, aka "Flunkies"

Flunky jobs primarily exist to make someone else look or feel important. Throughout recorded history, rich and powerful people would surround themselves with servants, clients, sycophants, and minions of one sort or another.