It does make sense though if you look at it from a particular angle; maybe some demons have hi-tech, but the majority are mindless thugs. If you are one of the technocrats, you provide them with technology they can understand. A similar line of thought was explored in one of the chapters of Iain Bank's "Use of Weapons", where an interstellar war with proxy battles between races allied to the 2 sides end up with ludicrous scenarios like mounted cavalry shooting down fighter-jets using crossbows with guided explosive warheads on the bolts.