But would opening up 1 artifat skin in LFR really change anything for you? I like the way you play, its the way which all people should play, playing the content they like and unsubbing when they are done with that content. But having to do LFR 1 hour a week does not really seem like a reason for you to stay subbed.
Also, if you remove all reward from raiding, then why should people even raid? It is content which requires work, both in-game and often outside of the game. It also requires quite a lot of dedication, since you will often find alot more failures in raiding then the rest of the game. So there has to be an equal reward for the hard work being put into the content and gear/item lvl upgrades is simply not enough.
The large reason why many people does not go into mythic raiding, is because the reward for clearing an instance is gone, since you have to clear a raid on heroic before going into mythic. So in mythic, the only reward is the gear and a few unique gear pieces, which is simply not enough for people to that extra mile. If there was not a mount reward from killing Archimonde HC, then i would bet that the number of people who have cleared that place, would be much lower.
So the extra reward is needed. I would have understod the quest alot more, if it was actually only completable in heroic and mythic, but having it in normal is okay too