Very interesting article and input. I work with Homunculi, though they are not fictitious they are easy (and pleasant) to live with and I also send them off to assist others if there is a need.
They are exact doubles of me in every sense, so they act and react as I would and they report to me in a way they know I understand in an instant. They know everything I know, they in truth, are me, so they bring learning to me as they report to me, and they apply any required knowledge or healing.
Combining High Magic with Divine Magic is a natural step, and I think each person steps onto a path would benefit from working personally with their Homnunculus (before increasing their number).
I look forward to seeing what others have to say.
Blessings
)O(