I had a similar gut feeling. To use some possibly dubious and dated terminology, would a guardian angel also emulate my shadow self, particularly if that self was an important part of my identity? If I usually manage not to let my shadow self act out, but you could always tell it was there, would the same be true for my guardian angel? If all you do is use your guardian angel to write essays, then sure, a relatively low risk tool. But if military commanders are using it to oversee offensive drones (as proposed in the essay)?! Oof.