Pretty sure the real issue is safety. Obviously you want to avoid exposed hot contacts and arcing, but also thermal safety is a pretty big deal. Addressing that

Pretty sure the real issue is safety. Obviously you want to avoid exposed hot contacts and arcing, but also thermal safety is a pretty big deal. Addressing that increases cost, so companies don't want to do it unless there's enough proven demand at that location to pay it back quickly. Same problem as internet access or mail delivery to rural areas, and the same solution suggests itself.