Was 1986 The Best Year In Heavy Metal History?

I would honestly have to say no, because heavy metal is a constantly changing genre, for example what some people call heavy metal are bands like megadeath and others of the sort. other people have a very different view on heavy metal some people consider allot of black or death metal to be heavy metal. when it comes to metal i think that a person needs to be very specific in the metal styles because there are so many, im talking like hundreds of different styles. i would also consider most of the bands you have listed to not be heavy metal bands.