> university professors don't necessarily have the authority or budget to hire assistants.

Agreed, hiring in academia is both painful and tricky. But someone running a grad program for the department and who is as overloaded as the author with other duties is well placed to advocate for a secretary or a grad assistant to lighten his non-core duties.

> And much of the stuff they deal with absolutely requires their unique skills: delegation leads to errors and omissions with serious consequences.

More than for a bus driver, nurse, cook, physical therapist, etc., etc., etc.? The world is full of people who volunteer and self-assign tasks to their breaking point; then burn themselves out. They feel that they can do X best, so they convince themselves that they must. With very few exceptions, this is BS and a non-productive path to burnout. Don't be like that.