I dont the answer to that either, but i reckon its coz some people are very extreme, i would say its cos at the time of prophet (saw) they obviously didnt have electricity. But for someone to say that we shouldnt have electricity cos at that time they didnt have it, would just be stupid, bt i wouldnt put it past some people, its these kind of people who end up leading people away from islam by making it so strict and extreme, and its not like that, Allah has gave us provisions to make things easy for us, so we should use them. This is my opinion anyway. Not saying that this is the reason they had this discussion about electricity, could have been something else.