Even the front desk secretary of a mid size tech company has to deal with the occassional deranged person wandering in.
All jobs are made up of numerous tasks, but just because the CEO tidies his desk periodically does not make him a janitorial worker.
e.g. Magical unicorn work, lizardmen work, etc…
It's language, it's describing an abstract concept.
There are an infinite number of possible abstract concepts.