Putting aside energy costs, Object detection is still crappy and has stalled. YOLO/SSDMN were impressive as all get-out, but they stink for general purpose use. It's been 3 years (?) and general object detection, even with 100 classes, is still unusable off the shelf. Yes, I understand incremental training of pre-trained nets is a thing, but that's not where we all hoped it would go.