Let me start with a few general comments on this essay and maybe get into more detail in a later poest.
Mike Hubler's piece on the intersection between Jacques Ellul and KB on technology is brilliant. It rewards a careful reading. I highly recommend it.
One thing Hubler emphasizes that stood out for me is the ambiguity inherent in the agent-agency "inversion" he speaks of, the way in which technology, construed as "obviously" an agency in our gadget-overloaded world, is, from another angle and by way of contrast, seemingly in the saddle and riding humankind at an incredible gallop. Consequently, the fluidity of the pentadic terms and concepts can just as easily render "technique" as agent in a straight agent-agency correspondence, with the symbol-using/misusing animal as the tool of his or her mechanized creations.